12. Short answer questions II

Describe the structure and working of the human heart.

 

a. The human heart has  different chambers that prevent the \(O_2\)-rich blood from mixing with the blood containing \(CO_2\).

 

b. The  receives deoxygenated blood from different parts of the body through the main veins - superior vena cava, inferior vena cava and coronary sinus.

 

c. The right ventricle contracts, and the blood enters the .

 

d. Through the pulmonary artery, blood is pumped to the for oxygenation.

 

e. bring oxygenated blood from the lungs to the left atrium.

 

f. From the left atrium, the blood reaches the left ventricle due to the contraction of the left atrium. The oxygenated blood is forced into the ventricle through the atrioventricular openings by the atrial contraction. Next, the left ventricle contracts and blood is pumped out to the various parts of the body through the  , that supplies the oxygenated blood to various parts of the body.