Heart

The video explains the heart's role as a muscle that pumps blood throughout the body. It describes the heart's structure, including its chambers and valves, and details the functions of the right and left sides of the heart. The right side pumps blood to the lungs for oxygenation, while the left side circulates oxygen-rich blood to the body. Heart valves ensure one-way blood flow, creating the heartbeat sound.

Explain how blood is directed through the body after leaving the heart.

What role do heart valves play in blood circulation?