At a resting rate near 70 bpm, the heart clears roughly 100,000 beats a day and pumps on the order of 7,500 liters — a quiet tanker schedule in your chest.
Muscle fibers never clock out; valves keep one-way traffic through two loops, lungs and body.
Reliability is the design brief. Treat blood pressure, sleep, and movement as maintenance for a pump that never gets a day off.
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