Human Heart

How does human heart work?

A rhythmic pumping of the heart helps blood to run through blood vessels. To learn its working procedure we have to know its basic structure. Human heart has four chambers, two auricles and two ventricles. The other name of auricle is atrium. Blood can flow from right auricle to right ventricle and from left auricle to left ventricle. There is a wall in between left and right chambers, so blood cannot pass from left to right or right to left.

When auricles expand blood enters into those chambers through veins. As auricles become full, they contract and blood enters into ventricles through respective openings. When the ventricles become full of blood the openings between auricles and ventricles get closed by small muscular doors. These doors are called valves. These valves open towards ventricles but never open in opposite direction. Now the ventricles contract to drive blood out of it through arteries to different parts of our body.

The contraction and expansion of the heart is commonly called heart beat. This is a continuous process and it helps the blood to circulate throughout the body. Circulation of blood is necessary for the transportation of nutrients, oxygen and other necessary materials to all parts of our body. Similarly, this process helps to collect unwanted and toxic materials from different parts of our body and to carry it to some other specific organs to remove thereby.

Note:

When heart fails to beat, a small battery operated machine is fitted in our body. It sends impulse to help heart to beat in normal rhythm. This machine is called Pace maker.



Fifth Grade

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