How the Heart Works

The video tutorial explains the heart's structure and function, focusing on its role in circulating oxygenated blood throughout the body. It details how red blood cells transport oxygen using hemoglobin, likening the process to a shuttle bus system. The heart's four chambers and valves ensure one-way blood flow, with deoxygenated blood returning to the heart and being pumped to the lungs for oxygenation. The tutorial also covers the heart's electrical system, highlighting the sinoatrial and atrioventricular nodes' roles in maintaining proper heart function. In some cases, pacemakers are used to regulate heartbeat.

How does the heart ensure that blood flows in one direction?

Explain the function of the sinoatrial node.