From where does blood enter the heart after circulating through the body?

Blood enters the heart after circulating through the body into the right atrium. This is the chamber that receives deoxygenated blood from the systemic circulation, specifically through two large veins known as the superior vena cava and the inferior vena cava.

As blood travels through the body, it delivers oxygen and nutrients to tissues and collects carbon dioxide and other waste products. Once this process is complete, the deoxygenated blood is returned to the heart, entering the right atrium. From there, the blood moves into the right ventricle, which pumps it to the lungs for oxygenation.

This process is essential for maintaining proper circulation and ensuring that the body receives the oxygen it needs to function effectively while removing carbon dioxide, a waste product of metabolism.