Physiology of the human heart

Functioning of the human heart

Here are some facts that allow us to better understand the functioning of the human heart.

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The human heart weighs between 225 and 335 grams and its size is similar to a closed fist. It is located between the lungs and slightly shifted to the left.

No stops working

The heart has four chambers: two atria and two ventricles. Every minute whole blood pumped body and distributed all body cells.

No looking back

The purpose of the four heart valves that holds is to prevent backward flow of blood. Are situated as follows: two between the atria and ventricles, and the other two at the beginning of the aorta and the pulmonary artery. Heart valves are closed and open 4,000 to 5,000 times per hour.

I have a broken heart

In effect, the heart is divided into two parts or halves. The right half gets the blood is directed to the lungs for oxygen. The left side pumps oxygenated blood throughout the body.

My intern​al circulation

The blood reaches the heart through the right atrium, from there goes to the right ventricle and goes to the lungs for oxygen. When returning from the lungs does the left atrium, and from there it goes to the left ventricle with its contraction pushes blood throughout the body. The valves have a mission to prevent the backflow of blood during this circuit.

Late, late and still beating

With a frequency of 70 beats per minute, the heart will beat in one hour about 4,200 times. On a day that is about 100,000 times. After a year, the heart will beat about 37 million times. During a lifetime of about 75 years will beat 2,759,000,000 times each.

The pulse signal life

When taking the pulse of a person shows the activity of the heart to pump blood. Pulse gives us valuable information not only on the functioning of the heart, but the state of the arterial walls as each heartbeat transmits its power artery walls.

Why am I so annoying?

Who gives the order to the heart to beat? Sinual nodule is located in the right atrium. This part of the heart (sinual node) is connected to the brain by the autonomic nervous system with the brain determines whether emotional, environmental, physical, etc. should produce a change in heart rate.

Athlete's heart

A person performing exercise maintained for years can have a heart of larger than normal, with wider cavities and thicker muscle fibers. This enables an athlete eject more blood with less effort, which is why your heart rate is below normal.

The electrocardiogram, heart ITV

Thanks to an electrocardiogram can diagnose heart disease, such as rhythm disturbances and heart rate (bradycardia and tachycardia) or coronary insufficiency (angina pectoris and myocardial infarction). This is shown by the study generates an electrocardiogram graph. In the chart you have to know the layout of the P waves Q. R. S, T.

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