Through which chamber does deoxygenated blood enter the heart?

Deoxygenated blood enters the heart through the right atrium. This chamber receives blood from two major veins, the superior and inferior vena cavae, which carry blood that has returned from the body devoid of oxygen. The right atrium then collects this blood and is responsible for pushing it into the right ventricle, from where it will be sent to the lungs for oxygenation.

The left atrium, right ventricle, and left ventricle have different roles in the circulatory system. The left atrium receives oxygenated blood from the lungs, while the right ventricle pumps deoxygenated blood to the lungs for reoxygenation. The left ventricle is crucial for pumping oxygenated blood to the entire body. Thus, the correct entry point for deoxygenated blood into the heart is indeed the right atrium.