explain why thigh muscles get tired soon but not the muscles of heart
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4
Answer:
Cardiac muscle fibres continue
to contract and relax tirelessly throughout life . The movement is not under the control of will. Fatigue is absent as the fibres do not produce lactic acid. While the thigh muscles are striated and produce fatigue through lactic acid .
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3
Answer:
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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