ANATOMY

Detailed explanation-1: -Muscles require a large amount of energy to function. This is provided primarily by mitochondria in cells that consume a lot of energy. We therefore find more of these powerhouses of the cell in muscle cells than in other cell types with a lower metabolic rate.

Detailed explanation-2: -During strenuous exercise, the rate of energy use in skeletal muscles can increase by more than 100-fold almost instantly. To meet this energy demand, muscle cells contain mitochondria. These organelles, commonly referred to as the cell’s “power plants, ” convert nutrients into the molecule ATP, which stores energy.

Detailed explanation-3: -In many cell types, including heart muscle cells, ATP is mainly produced inside compartments called mitochondria. Each heart muscle cell contains between 5, 000 and 8, 000 mitochondria.

Detailed explanation-4: -Smooth muscle cells present highly irregular outlines and large numbers of mitochondria.