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Describe the flow of blood through the heart of human beings.
a. The right atrium receives from the different parts of the body through the superior and inferior vena cava. The right atrium relaxes during the process to collect the deoxygenated blood.
b. The right atrium contracts, and the right ventricle relaxes. Thus, the deoxygenated blood from the right atrium is sent to the .
c. The right ventricle contracts, and blood enters the . Through this, blood is pumped to the lungs for oxygenation. At the lungs, the exchange of gases takes place. The oxygen-rich blood is returned to the heart through the pulmonary veins.
d. The pulmonary veins carry the . The left atrium relaxes during the process to collect the oxygenated blood.
e. From the left atrium, the blood reaches the left ventricle due to the contraction of the left atrium. The left ventricle relaxes, and blood from the left atrium reaches the left ventricle.
f. 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 aorta. Aorta is the .
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