Oxygenated blood
Deoxygenated blood
Heart muscle
Valves
Structure Details
Welcome!
Click on any part of the heart to learn about its structure and function. Hover over structures to highlight them.
Did you know? Your heart beats about 100,000 times every day, pumping roughly 2,000 gallons of blood!
Cardiac Cycle
Heart is relaxing — chambers filling with blood
Controls
72 bpm
100%