What is the lower chamber of the heart that receives blood from the atria called?

The lower chamber of the heart that receives blood from the atria is known as the ventricle. Specifically, the heart has two ventricles: the right ventricle, which pumps deoxygenated blood to the lungs, and the left ventricle, which pumps oxygenated blood to the rest of the body. The atria (the upper chambers) collect blood returning to the heart and then pass it into the ventricles. This structure is critical for the heart's function, as it creates a systematic flow of blood necessary for maintaining circulation throughout the body.

Other terms associated with heart anatomy, such as aorta, atrium, and vein, refer to different components or functions within the circulatory system. The aorta is the large artery that carries oxygenated blood from the left ventricle to the body. The atrium refers to the upper chambers where blood enters. Veins are blood vessels that carry blood back to the heart and are not chambers of the heart themselves. Understanding these distinctions is key to grasping how blood circulates through the heart and the entire bodily system.