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Skeletal muscles tire when repeated contraction outruns recovery. Cardiac muscle is built for continuous work: dense mitochondria for energy, a rich blood supply, and specialised structure that resists fatigue under normal conditions.

The heart also rests briefly between beats — diastole — when chambers fill. It is not “always contracted”; it cycles contract and relax thousands of times a day.

Biology students in Gulberg Residencia Islamabad can contrast cardiac, skeletal, and smooth muscle in one comparison table rather than memorising isolated facts.