Question

Why do voluntary muscle fibers contain large number of mitochondria and glycogen granules?

Answer 1

Answer:

Mitochondria is the power house of the cell because it gives energy for the activities of the cell in the form of ATP. Muscle cells need energy to do mechanical work and respond quickly. Thus a higher number of mitochondria is present so that the cells requirement of energy to perform its specific function is fulfilled.

Fast-twitch (type II) muscle fibers contract more rapidly due to the presence of a faster myosin. Type II fibers can be subdivided into those that have large amounts of mitochondria and myoglobin and those that have few mitochondria and little myoglobin. The former primarily utilize aerobic respiration to generate energy, whereas the latter rely on glycolysis. The lack of myoglobin results in a paler color than the slow-twitch muscles, and fast-twitch fibers may therefore be referred to as white fibers. These muscles are important for intense but sporadic contractions; for example, those that take place in the biceps. Therefore they need a large amount of mitochondria and glycogen granules.

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Explanation:

Answer 2

Explanation:

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