Question

How many chambers are in the heart? What are their names?

Answer 1

Heart is a hollow muscular organ. It supplies blood to each part of the body by regular contraction and relaxation. It is about the size of a clenched fist. It is situated in the middle of the chest, between the lungs. The heart is surrounded by a double-layered membrane called the pericardium. It is also filled with liquid.

Complete answer: The human heart included in the circulatory system is one of the major organs of the human body. The heart has a total of four chambers:- two upper atria, two lower ventricles. The atria are divided as the right atria and left atria. The walls of atria or auricles have generally thinner walls because their work is to receive deoxygenated blood and pass it to ventricles. And the ventricles are divided into two parts:- the left ventricle and right ventricle. The walls of ventricles are thicker, as because their function is to pump blood. But the right ventricle pumps deoxygenated blood to lungs for oxygenation. And the left ventricle pumps oxygenated blood to the body parts.

Additional information:
The circulation of blood begins with the contraction of the atria. At this time the ventricle is relaxing and empty. So the blood from the atria passes to the ventricles. When blood reaches the ventricles, the ventricles contract and atria relax. On contraction of the ventricles, the blood passes from ventricles to the lungs for oxygenation. Then the blood reaches lungs, gets oxygenated and returns to the right atria with the help of the pulmonary artery. Then the atria contract, which makes the blood flow to the ventricles. The blood then gets ready to move into the aorta for distribution.

Note: When the blood moves from right ventricles to lungs, to prevent the backflow of blood, the atrio-ventricular valves close down. Giving a club sound. And when the blood moves to the aorta for distribution, the semilunar valves close to prevent backflow of blood. And this gives a Dub sound.