Index / Human Anatomy / Human Heart
Human Anatomy
Human Heart
Four-chambered muscular pump
A fist-sized muscular pump that drives pulmonary and systemic circulation. Its four chambers, four valves, and SA-node pacemaker keep blood moving every second of life.
Key specifications
Mass
250–350 g
Beats/day
~100,000
Output
7,500 L/day
Chambers
4
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