What chamber of the heart does deoxygenated blood enter from the body?

Deoxygenated blood enters the heart through the right atrium. This chamber receives blood from the body via two major veins: the superior vena cava and the inferior vena cava. The superior vena cava carries blood from the upper parts of the body, while the inferior vena cava brings blood from the lower parts. Once the right atrium fills with deoxygenated blood, it contracts to push the blood into the right ventricle, which then sends it to the lungs for oxygenation.

The left atrium, left ventricle, and right ventricle do not deal with deoxygenated blood entering from the body. The left atrium receives oxygenated blood from the lungs, while the left ventricle pumps that oxygen-rich blood out to the body. The right ventricle is responsible for pumping deoxygenated blood to the lungs but does not receive it directly from the body; it receives blood from the right atrium. Understanding this flow is crucial in grasping how blood circulates through the heart and the entire body.