Human Heart Anatomy: The Four Chambers and Their Functions
The Heart's Four-Chambered Pump: A Coordinated Circuit
The human heart has four chambers—right atrium, right ventricle, left atrium, left ventricle—arranged in two side-by-side pumps that keep deoxygenated and oxygenated blood completely separate.
The Circuit
- Right atrium receives systemic venous return (~5 L/min) via the SVC and IVC.
- Right ventricle pumps this deoxygenated blood through the pulmonary artery to the lungs at low pressure (~15 mmHg).
- Left atrium receives oxygenated pulmonary venous return.
- Left ventricle generates high pressure (~120 mmHg) to eject blood into the aorta for systemic distribution.
The atria act as primer pumps (atrial kick contributes 20–30% of ventricular filling), while the ventricles provide the main propulsive force. Valves ensure unidirectional flow: tricuspid and mitral (AV valves) prevent backflow into atria; pulmonary and aortic (semilunar valves) prevent backflow into ventricles.
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