Cardiac muscles seldom get fatigues because
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★ So well because it's got more mitochondria than skeletal muscle.
• Cardiac muscle generally has a higher concentration of mitochondria, which increases its requirement for oxygen.
• Cardiac Muscles contain the highest density of mitochondrion, upward to the range of 2000–5000 per cell, where skeletal muscles have 50–200 per cell.
• With so many power houses at its disposal, the cardiac muscles doesn’t need to stop and chill out. It also has a steady supply of blood bringing it oxygen and nutrients.
• The daily total heart oxygen consumption is about 35.7 L of oxygen and burns about 1500 calories.
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