ANATOMY
MUSCULOSKELETAL AND SOFT TISSUE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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High resistance to fatigue
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High force of contraction
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High capillary density
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High speed of contraction
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Detailed explanation-1: -Type IIB fibers have high myosin ATPase activity (pH 9.4), are fast twitch, have low oxidative and high glycolytic capacity, and fatigue rapidly.
Detailed explanation-2: -Type 2B (FG) fibers primarily use anaerobic glycolysis as their ATP source. They have a large diameter and possess high amounts of glycogen, which is used in glycolysis to generate ATP quickly to produce high levels of tension.
Detailed explanation-3: -Type II fibers are the fast twitch muscle fiber. They are called fast twitch due to their ability to quickly generate force compared with type I fibers (3-5x faster), however they will fatigue at a much quicker rate (McArdle et al., 2015).
Detailed explanation-4: -So, the correct option is ‘Few mitochondria and high glycogen content’
Detailed explanation-5: -“Type 2b is used for very short-duration, high-intensity bursts of power, such as maximal and near-maximal lifts and short sprints.” Your body uses type 1 muscle fibers, aka “slow-twitch” muscle fibers, during prolonged, steady-state exercises that require endurance (e.g., a 10k run or a long, leisurely bike ride).