Question

Cardiac muscle cells have a higher concentration of mitochondria than
skeletal muscle cells. What does the difference in mitochondrial
concentration MOST likely indicate about cardiac muscle cells compared
with skeletal muscle cells? (Why do they have more mitochondria?)
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Answer 1

cardiac muscle require lot of energy to perform while skeletal muscle are used in coordinate of bone moments so they require less energy since mitochondria is powerhouse cell so it is highly concentrated in cardiac muscle...