Deoxygenated blood from the body enters through which of the following chamber of the heart of humans?
Right atrium
The question asks which chamber first receives the deoxygenated (impure) blood returning from the body, so we must trace the path of blood through the human heart.
The human heart has four chambers: two thin-walled upper chambers called atria (right and left), which receive blood, and two thick-walled lower chambers called ventricles (right and left), which pump blood out.
Deoxygenated blood collected from all over the body is carried back to the heart by two large veins, the superior vena cava (from the upper body) and the inferior vena cava (from the lower body).
These veins empty into the right atrium, which is therefore the chamber that receives deoxygenated body blood.
From the right atrium the blood passes through the tricuspid valve into the right ventricle, which then pumps it through the pulmonary artery to the lungs, where it is oxygenated.
The left atrium and left ventricle deal only with oxygenated blood: the left atrium receives oxygen-rich blood returning from the lungs via the pulmonary veins, and the left ventricle pumps it out to the body through the aorta, so neither handles the incoming deoxygenated blood.
Hence deoxygenated blood from the body enters the heart through the Right atrium.
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