The heart is a muscular pump composed of four chambers and numerous valves that work in perfect coordination to circulate blood throughout your body.
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How does blood know which direction to flow in the heart?
Valves act as one-way doors. They open when pressure behind them is higher, allowing flow forward, and close when pressure behind them drops, preventing backward flow. This creates automatic directional control.
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Why does the heart beat continuously without getting tired?
The heart muscle is specialized for continuous contraction. Its cells contain many mitochondria for energy production. Unlike skeletal muscles, heart muscle does not accumulate fatigue-causing lactate.
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What is the purpose of the pericardium?
The pericardium is a protective sac that surrounds the heart. It reduces friction as the heart beats and produces lubricating fluid. It also prevents the heart from expanding excessively.
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