Doctor Warrick

The heart is the most important organ as it pumps blood to supply oxygen to cells and remove carbon dioxide waste. Blood returns to the heart through veins and is pumped to the lungs by the right side of the heart. In the lungs, blood releases carbon dioxide and takes up oxygen. Oxygen-rich blood then enters the left side of the heart which pumps it to the body tissues. The heart has valves to ensure blood flows in one direction. Each heart cell can generate its own electrical signal which coordinates the heart's pumping action. The electrical system acts like a timing mechanism for the heart's pumping function.