Working Of Heart

The Heart and It’s Working

The veins walls are considerably thinner in comparison to arterial walls. The larger veins have a system of internal one-way valves which do not allow the blood from flowing downward under the pull of gravity when person stands up. When a human being makes movement, the veins get squeezed by the surrounding muscle that helps in moving more blood towards the heart. Without valves in the veins, blood would move in the legs, which would then be continuing to grow.

The Pulmonary Circulation

The most important function of the pulmonary circulation is to transfer oxygen to the blood and free it from carbon dioxide. This task is completed when the blood flows through the lungs. The pressure at this part of the system is only about one-sixth as great as in the systemic circulation, and the pulmonary arteries walls and veins are thinner in comparison to the walls of other vessels in the rest of the body. In the pulmonary circulation, the role of arteries and veins are the opposite of what they do in the systemic circulation. Blood in the arteries has lesser oxygen, while blood in the veins has higher oxygen. The circuit starts with the pulmonary artery, which extends from the right ventricle and brings blood with low level oxygen content to the lungs. In the lungs, it branches off into the two different arteries, one for each lung, and then into arterioles and capillaries. The gas exchange between the air we breathe in and the blood takes place in the pulmonary capillaries. Pulmonary Capillaries walls work like filters by permitting molecules of gas to pass through but not to molecules of fluid. The total surface area of the capillaries in the lungs ranges from around 500 to 1,000 square feet.

Control of Cardiothe

Blood Vascular function

Blood is a life-saving fluid which helps to maintain an optimum environment in the body by providing a regular supply of nutrients from the outer world and removing waste products from the tissues present in body. Its cells are produced in the bones marrow, primarily in the flat bones like the ribs and the breastbone. The volume of blood in an average adult human being amounts to around 10.5 pints.

Types of Blood Cells

The blood has two main components:

· Cells of several types

· Plasma solution, in which the cells are suspended.

The vast majority of blood cells are erythrocytes (red blood cells), which exceeds in number with white blood cells by about 700 to 1 in the healthy adult human being. The major function of the red blood cells is to transport oxygen. They contain a complex protein arranged around iron that carries oxygen and releases it whenever needed known as the red pigment hemoglobin. Red cells are smaller in comparison to white cells and live only for three to four months. These are generated at a rate of around 8 million in a second to maintain the supply regularly.

The white blood cells are known as leukocytes. There are several types, which differ in shape and size, but all of them share the same function of defending the body against a wide range of invading organisms. These are produced in increased amounts in response to any infection. The platelets are plate-shaped disks which together with special substances in the plasma, trigger the blood-clotting mechanism and prevent an uncontrollable loss of blood when the vessels are not working properly or they are damaged.

The Plasma

Plasma fluid is yellowish in color which consists of 90% water and various other salts like glucose, cholesterol, proteins and others. Proteins in the plasma perform different kind of functions like from transporting molecules of nutrients to acting as antibodies in the immune response. The cardiovascular system plays a most important role in maintaining homeostasis—which is a stable environment inside the body. It can carry out, or make other systems to carry out, rapid short-term adjustments according to demands placed on the body by various human activities and changes in external conditions. For an example, when blood supply to any particular area increases, the flow of blood to other organs must be reduced, or else the cardiac output must be increased. Throughout these changes, blood pressure must remain in the constant state to maintain the vital functions of all the body tissues. To make the adjustments, the cardiovascular system communicates with other body organs through a complex network of monitoring and signaling mechanisms. It transfers signals about its condition and, in return, receives messages to control its performance.

The two main regulatory centers of cardiovascular function are:

· Nervous system

· Kidneys

The Nervous System

The nervous system parts like brain and others constantly monitor and maintain the heart and its circulation. They receive information about the cardiovascular system through number of receptors which generate coded impulses describing about the body’s internal environment. Different types of receptors transmit information about the stretching of the arterial walls and the changes in blood pressure. When a person stands up suddenly and blood pressure begins to decrease, their receptors sense a lack of pressure and transmits signals to the heart to beat faster and the blood vessels to constrictor narrow down so that adequate blood pressure can be controlled.

The Heart and Circulation

In result to changes occurred, the nervous system gives adjustment commands. So, if the receptors find a decrease in oxygen and an increase in carbon dioxide in the blood, the brain issue a command to the respiratory center to increase the rate of respiration, which in response delivers more oxygen to the lungs. At the same time, the brain issues generates and accelerate the heart rate and on strict the veins. This transmits more blood to the lungs for the purification. In response, an adequate supply of oxygen to body tissues is ensured. Communications between the nervous and cardiovascular systems are relayed by chemicals known as neurotransmitters. These are the chemicals which travel between cells and can provoke a response in the targeted tissue. The neurotransmitter norepinephrine can increase the heart bit and force of contractions, as well as constriction of the blood vessels. Thus, if we become frightened somehow, more adrenaline is released, more blood is pumped out from the heart to muscles, and we feel better able to run or react if required.

The Kidneys

The kidney plays an important role in the regulation of blood pressure. Because they affect the volume of fluids in the body, they can affect the pressure by making changes in the volume of circulating blood. They release an enzyme known as rennin, which is converted into a powerful blood-pressure-elevating substance and constricts blood vessels and induces sodium and water retention. Delicate mechanisms of kidneys allow them to adjust under different varieties of situations.

Prashant Jain

SEO

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Heart and Circulation

The cardiovascular system which is an elaborate network in body performs two important tasks:

· It delivers oxygen and nutrients to body organs

· It removes waste products of metabolism from tissue cells.

Major components of the cardiovascular system are:

The heart- It is a hollow muscular pump.

Circulatory System- It is a system of large and small elastic vessels; it transports or conveys blood throughout the body. In one day, blood pumped through the heart of a normal healthy adult at rest reaches around 2,100 gallons.

Heart

Heart is the central organism of the cardiovascular system; it is located between the two lungs in the middle of the chest. Two-third part of the heart lies in the left of the breastbone and remaining one third in the right. Putting a hand on left side the chest, we can easily feel heartbeats on the left side of the rib cage because at that place, the bottom left corner part of the heart, that is somewhat tilted forward, comes nearest to the body surface. The heart of an adult is about the size of two clenched fists. Heart shape is conical and it weighs around 7 to 15 ounces, depends on the size and weight of the individual.

The Heart Chambers

The human heart has four chambers:

· The right atrium and right ventricle.

· The left atrium and left ventricle.

The chamber walls are made of a special kind of muscle myocardium which contracts rhythmically under the stimulation of electrical currents. The left and right atria and the left and right ventricles are separated from each other by a muscle wall known as the septum. Blood returning from the body through the venous system enters into the heart through the right atrium, where it is collected and is then pumped to the right ventricle. Each time when the right ventricle contracts; it propels this collected blood, which is low in oxygen content, into the lungs; there it is enriched with oxygen. Pulmonary veins transfer the blood to the left atrium, which contracts and pass it to the left ventricle. The left ventricle, which is the main pumping chamber of the heart, ejects the blood.

Prashant Jain


SEO

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The Heart and Circulation

The Heart and Circulation

Coronary Arteries and Veins

Heart never comes into rest condition while it transfers blood to the rest of the body system; it actually works harder in comparison to any other muscle in the body system and requires a much higher blood supply than other muscles. The heart gets blood for itself through two coronary arteries, the right and the left arteries, which leave the aorta about half inch above the aortic valve and run around outside of the heart. Both arteries lie in grooves at the outside of the heart muscle and branch off into a system of smaller vessels and capillaries which supplies the muscle fibers. After delivering off its oxygen in the capillaries, the blood passes through coronary veins and drains directly into the right atrium, where it joins the venous blood from the rest of the body. When the heart works harder than usual, the coronary arteries increases oxygen supply for the heart muscles. During the extreme physical stress, flow in these arteries may increase up to five to six times. When blood supply does not meet the increased requirements in oxygen and nutrients and to wash away wastage materials, the heart aches occurs, just as other muscles might ache from an excessive workload. The lack of oxygen causes nerve cells, and chest pain, or angina pectoris. In comparison to other muscles of the body, however, the heart cannot stop for rest without devastating consequences.

The Conduction System

Electrical current which regulates the heart activity starts in heart cells and extend through a specialized network of fibers known as the heart’s conduction system. Major elements of heart conduction system include the senatorial node or sinus, the atrioventricular node. The sinus node, called as the heart’s pacemaker, is a microscopic bundle of specialized cells that are located in the top right corner of the heart. Any portion of the heart muscle is capable of generating of electrical impulses, but in normal function, the impulses originate in this acemaker.

If the pacemaker’s functionality is interrupted, another part of the conduction system can take the charge over the impulse-firing task. Impulses are always transmitted through muscle fibers of the two atria to the atrioventricular node, located on the juncture between the right and left sides of the heart, in the area where the right atrium and right ventricle comes closer.

The Cardiac Cycle

Electrical activity which coordinates the rhythmic contraction and relaxation of the heart’s chambers are known as the cardiac cycle. Most of the currents in the heart are lesser than a millionth of an ampere but they exert a great influence on the heart muscle. The cardiac cycle is made up of two phases, known as diastole and systole. Diastole is a phase during which the heart’s ventricles are relaxed, is the longer phase, which takes up approximately two-thirds of the cycle. Systole is the second phase during which blood is ejected from the ventricles, takes up the remaining one third. During the diastole phase, the sinus node generates an impulse that forces the two atria to contract. In diastole phase, the tricuspid and mitral valves are always open, and blood is forced to flow from the atria into the relaxed ventricles. By the end of diastole phase, the electric impulse reaches to ventricles, causing them to contract. During systole phase, the contracting ventricle closes the tricuspid and mitral valves. Just after to that, the pressure of the blood inside the ventricles raises enough to force the pulmonary and aortic valves to open, and blood is transformed into the pulmonary artery and the aorta. When the ventricles relax again, blood backs up from the pulmonary artery and the aorta and closes the pulmonary and aortic valves. The pressure in the relaxed ventricles becomes lower than in the atria, the tricuspid and mitral valves open again, and the cardiac cycle starts a new process. This seems to be a long sequence of events but it is completed approximately in a second. The familiar double throb of the beating heart is a result of the two sets of synchronized contractions which occurs during the process of cardiac cycle: The throbbing sound that we hear comes not only from the snapping of the valves, but also from the accompanying vibrations of other heart structures and from the turbulence produced by the flow of blood.

Prashant Jain


SEO

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The Heart And Its Working

Heart rate and Cardiac Output

In an adult, the pacemaker makes almost 72 impulses in a minute in the rest condition; it means that in one minute the heart goes through a full cardiac cycle around 72 times. Normally, as good the physical fitness of an individual is, as slower the heart rate at rest will be. Some of the very good athletes are known to have a pulse rate of 35 beats per minute which is half the average figure for the general population. For them, the slow heart rate is enough and does not make any danger.

As the lungs are very close to the heart and the walls of the pulmonary vessels, which are thinner so offer less resistance, the right ventricle does not have to exert nearly as much energy to do its job of supplying blood to the lungs as the left ventricle does in supplying to the rest of the body, is known as the cardiac output. When there is a requirement for an increased blood supply, as during physical stress, the heart most increases its output by beating faster. This mechanism has its limits: Above a certain rate, the heart chambers do not have time to fill properly and fail to pump efficiently.

Stroke Volume

The cardiac output is examined by the heart rate as well as by the amount of blood that ventricles eject or pump out in each contraction. This amount is known as the stroke volume. Usually the ventricles force about half the blood they contain, which corresponds to about 3 ounces in an average person at his rest position. A decrement in the stroke volume is one of the first signs of a heart failing. When both ventricles pump out, the same amount of blood in each stroke, cardiologists usually measure only the stroke volume of the left ventricle.

Prashant Jain

SEO

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Home is Where the Heart is But is Also Where Most Accidents Occur

For most, the home is a pleasant and comfortable space, it’s a personal sanctuary from the chaos and interference of the outside world. It’s yours. It’s where you can relax, where you can have fun, it’s where you feel safe.

This word ‘home’ evokes so many pleasant thoughts and emotions but despite the safety that is felt within its walls, that very same ‘home’ can be a dangerous treacherous place.

The parallel reality is that almost 4000 people in the UK each year die in accidents that occur in the home environment, and approximately 2.7 million domestic accidents result in a visit to accident and emergency centres for treatment. Going by the 2007 population figures, that 2.7 million people is the equivalent of 4.5% of the UK population sustaining injuries at home that result in visits to accident and emergency departments. We can only guess at the figures of injuries that occur within the home environment that don’t result in visits to hospitals.

The somewhat scary statistics were collated by the Home and Leisure Accident Surveillance System in 2002. Exact numbers for following years are unfortunately not available as funding was withdrew by the DTI following the 2002 release, although estimates indicate that accident levels have remained broadly the same.

These accidents rarely attract pubic and media attention and RoSPA (the Royal Society for the Prevention of Accidents) is one of the few national voices speaking out on the issue of safety within the home environment . Safety in the home is often overlooked and the majority of people may be guilty of cutting corners when carrying out tasks within the home, for instance when carrying out DIY work. A lot of people also don’t recognise the need to own and keep suitable first aid items such as a first aid kit and antiseptics in the home, when really such items should always be stocked, especially if there are children in the house.

Of the 2.7 million that visited accident and emergency after a domestic accident, just short of a million were children. Children are, by nature, prone to sustaining minor injuries, but the injuries that resulted in visits to accident and emergency must have been reasonably substantial. But could some of these have been instances where the parent could have, but did not know how to deal with the injury themselves? Or perhaps that they did not have any suitable first aid items to treat the injury stored at home?

This Article is brought to you by First Aid Warehouse, UK’s premier supplier of the first aid kit and blood pressure monitors


The author is a Client Account Manager with Summit Media. We are an online marketing company and my contact details are as follows:


John Kaduwanema

SEO Analyst

Summit Media Online Marketing

Wolds Media Centre

Brough

East Yorkshire

HU15 2JZ


tel. +44 (0)1430 425807

fax. +44 (0) 1430 425808

john.kaduwanema@summitmedia.com

www.summitmedia.co.uk

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Get Omron HEM 790IT Before You Suffer a Stroke or Heart Attack


www.omronhem790it.net Everyone always wants to be health. They don’t want to suffer stroke, heart attack etc.Hypertension is a silent killer in human. So We should monitor our blood pressure.Omron is one of the best Health Equipment manufacturers.Now Omron has launched a series of products Omron HEM 790IT. Take care your health with a blood pressure monitor every where you want….(this video from valuephcy. I Just upload it)

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Get Instant Workout Feedback with Heart Rate Monitors

In this fast-paced life, exercise is one of the important factors that let you manage your fitness. It also helps you keep away stress and depression and heals injuries. To be healthy and feel healthy, one should adhere to an active lifestyle. Walking, jogging, cycling, or any regular exercise makes the best part of a healthy lifestyle. Lack of exercise will not only leave you weak and fatigued, but will also put you in danger. If you have not yet started your body workout, it’s high time you start it.

Once we start our routine body workout, we want to keep track of the results. Am I losing enough calories? Am I doing the exercises right? All these questions will come in your mind. Heart rate monitors will provide you the answer. Even as you exercise, you can get instant workout feedback with heart rate monitors. So, if you are trying to lose weight, then a heart rate monitor is great way to monitor the amount of calories you burn due to regular exercises.

You can select from a variety of heart rate monitors from Wholesale Point that suit your need and budget. Polar, Mio, Omron, Ekho, and Reebok are some of the top brands available. Here are some of the tips to make you choose easily.

For basic needs, the Polar FS1 heart rate monitor is a good choice. It gives you the accurate heart rate, total exercise time, and average heart rate of total exercises. You can go for Mio classic select heart rate monitor watch which has a distinct calorie management system. It can count the calories burnt during the exercise, and also, track calories consumed against the daily calorie target.

Professional athletes need heart rate monitors with advanced features. The Polar F6 heart rate monitor is best choice for them. Being an excellent exercise motivator, this device features weight management, computer connection, and recording. So, select from one of the heart rate monitors to track your progress towards a healthy lifestyle.

http://www.heartratemonitorsite.com

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Why Use a Heart Rate Monitor?

Why use a heart rate monitor?  Is it yet another worthless gadget that exercise equipment manufacturers are selling as part of their plan to squeeze more money out of your pockets?  Or does it have real value?


Thankfully, in this case, there’s no consumer deception at work.  A heart rate monitor is a  valuable tool and should be included in your fitness lifestyle.


Here are three reasons why you should consider adding one to your exercise routine.


1) Track the intensity of your workouts.


The most fundamental reason to use a monitor is to track whether you are exercising in your target heart rate zone — a range defined as between working out too hard, and not hard enough.  For most of us, our target heart rate zone lies between 50% and 85% of our maximum heart rate, and is the territory in which efficient calorie and fat burning takes place.  


With a basic monitor strapped to your chest, wrist, or finger, it’s easy to know whether you’re in the “zone,” or if you need to push harder, or ease off a bit.


2) Chart your progress.


When you’re new to exercise — or, like many of us, are just getting back into the groove after a long hiatus — your heart has to work extra hard to keep up with your body’s need for blood and oxygen.  As you continue to work out, however, your cardiovascular fitness improves — meaning, your heart doesn’t have to pump as rapidly to sustain your exercise sessions.


Armed with a quality heart rate monitor, it’s a simple matter to chart your progression.  When jogging 20 minutes on the treadmill used to get your heart rate up to 140 beats per minute (bpm), and you can now perform the same workout at 125 bpm, you know for certain that you’re in better shape.  


And you also know that it’s time to kick up the intensity of your workout!


3) Stay motivated.


Having actual numbers to gauge your progress is a powerful motivator.  You worked out on the stationary bike at 135 bpm this month — can you get that number down to 120 bpm over the next three months?  


This kind of useful feedback can keep you excited about your fitness routine, and inspire you to set new goals. (Of course, don’t go overboard, and be sure to keep your physician informed about your activities.)


There is a growing variety of quality heart rate monitors on the market today.  Polar, Timex, Mio, Omron, and Reebok are among the most popular brands.  Shop around, read reviews, and pick the model that best matches your lifestyle.  You’ll be sure to reap many benefits as you continue along your path to better fitness and health.

A long-time passionate researcher of health and fitness issues, Brandon Massey runs a home exercise equipment reviews web site. For heart rate monitor reviews and advice about other fitness equipment that can help you lose weight, increase stamina, and build muscle, visit his site now.

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Polar F6 Heart Rate Monitor

A heart beat rate monitor that is useful is extraordinarily useful if one wants to gauge heart activities that match their unique health goals. This personal training device is excellent for those with heart Problems, those who need to burn the calories, or those that take their work-outs seriously. The makers of the Polar Rs200sd heart rate monitor particularly are believed to be the pioneers in the sector of wireless electrocardiogram devices. The Polar Rs200sd Heart Rate Monitor in particular is a new model that speaks of Polar heart monitors quality and durability.

Come visit us right here for more info on Omron Hr 100C. We are the greatest source of info on Polar Heart Rate Monitors Review today.
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The Rs in the latest Polar Rs200sd pulse rate monitor addition stands for running sports. Meanwhile, the sd relates to the inventive speed and distance featured in the foot pod Polar technology.
Meanwhile, the foot pod provides a variety of info that includes speed and distance per kmph/mph. Another info presenting the target pace similarly includes alarms and differentials that give accurate signals when necessary.

While on the run, this Polar heart monitor allows one to change five screens that may indicate varied results for heart beat rate, calories, and lap time. During exercise programs, the wrist-watch can be customised to be able to choose between free, basic, interval and user-created routines. Even while one is asleep, the Polar Rs200sd heart monitor also has a sleep mode which helps measure one’s resting heart rate.

however , this Polar heart monitor doesn’t jut maintain a record of the heart activity but helps in the athlete’s overall way of life too. As an example, it has an event countdown calendar that helps one check the amount of days before a long awaited sports event.

What has made Polar Rs200sd heart monitor preferred though isn’t just its functionality but its creative design too. The foot pod particularly is durable and comfy when it is attached to the shoe. This can be done gently with warm water.
The Real Deal

What really matters is that Polar Rs200sd heart monitor will help you save your own life. With its correct readings, you are guaranteed that you don’t go beyond the heart rate for that delicate heart sickness or you don’t work it too hard when exercising.
A standard 2-year warranty for Polar Heart Monitors is likewise more than a great guarantee for every health-obsessed individual on the planet. .

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Come visit us right here for more info on Polar Rs200. We are the greatest source of info on Polar Heart Rate Monitors Review today.
http://polar-heart-rate-monitors-review.com

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Omron HR-100C Heart Rate Monitor


Go to: www.amazon.com Being a person who hasn’t ever joined a gym, I never knew stuff like this existed. I was very interested in this item because I’ve been walking for exercise but wasn’t really sure I was reaching my target heart rate consistently. The monitor, which displays the time as well as your heart rate on a watch, works in conjuction with a gizmo that you strap around yourself, just under your chest. (I will tell you, since I was concerned about this, that it’s hardly noticeable once it’s in place…it’s a 12″ or so long piece of plastic with an adjustable elastic strap…not very bulky at all!) The monitor also features a stopwatch and an alarm, so that after you set your minimum & maximum desired heart rates, you can be alerted when you are out of range. The alarm is a “beep-beep” that I can hear over the book on tape I drag along with me. Your heart rate is updated every second or two so you will always know if you need to pick up the pace a bit. Although I have not yet had to do so, the chest strap has a removable backing, and you apparently can change the battery yourself (this is a big deal, I guess, since some of the more expensive monitors require that you send them to the factory for a battery change). The elastic strap is also completely removable, which makes it very easy to wash (and you will need to if you’re exercising!). The monitor comes packaged in a small, zippered carrying case, and includes an attachment that allows you to place it on a …

9:42 am | | Tags: , , , , | 1 Comment »
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