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📖 Biology Glossary

Searchable A-Z glossary of biology and anatomy terms — clear definitions written for students at every level.

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Cardiac Cycle

Complete sequence of events in one heartbeat: systole (contraction) and diastole (relaxation).

Physiology
Cardiac Output

Volume of blood pumped per minute: Heart Rate × Stroke Volume. Normal resting ~5 L/min.

Physiology
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