Question

why our cardiac muscles do not get tires whareas our limb muscles get tired​

Answer 1

Cardiac muscle resists fatigue so well because it’s got more mitochondria than skeletal muscle. With so many power plants at its disposal, the heart doesn’t need to stop and chill out. It also has a steady supply of blood bringing it oxygen and nutrients.

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Answer 2

cardic muscles resists fatigue so well it's got more in mitochondria than skeletal muscle.