Question

explain workinh of heart????​

Answer 1

$\underline{\underline{\textbf{Working of Human Heart :}}}$

→ First of all, all the deoxygenated blood from the body with the help of superior and inferior vena cava came in heart. 

→ After it, it came in Right atrium and then Right ventricle.

→ Contraction of auricles derives most of the blood in into the ventricle. At the end of the auricular systole, auricles start relaxing and the contraction of the ventricles simultaneously.

→ As the contraction of the ventricles begins, the pressure of the blood in the auricles rises. With this pressure, the flaps of the auricular ventricular (A-V) valves are pushes up and meet to close the A-V apertures. This tight closure of the A-V valves at the start of the ventricular contraction produces the first heart beat, which is "Lub".

→ Now the ventricles start relaxing. The semilunar valve close as they get filled the blood trying to return and meet together, closing the outlets of the great arteries. 

→ The closing of the semilunar valves at the start of diastole produces the second heart sound "Dup".

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Answer 2

Explanation:

The heart is a muscular organ that pumps blood continuously throughout the body. It is comprised of four chambers — the right and left atrium and the right and left ventricle. The chambers of the heart work together by alternately contracting and relaxing to pump blood throughout the heart.