The key difference between type 1 and type 2 muscle fibers is that the type 1 muscle fibers contract slowly while the type 2 muscle fibers contract rapidly. Moreover, type 1 muscle fibers depend on aerobic respiration while type 2 muscle fibers depend on anaerobic respiration.
What is difference between type I fibers and type II fibers?
Skeletal muscle fibers can be categorized into two types: slow-twitch (Type I) and fast-twitch (Type II). Type I muscle fibers are more efficient over long periods of time. They are mainly used for postural maintenance (such has holding the head upright), or endurance exercises (like marathon running).
What is a characteristic of a Type 2 muscle fiber?
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).
What is a characteristic of Type 1 muscle fibers?
Type I fibers are identified by slow contraction times and a high resistance to fatigue. Structurally, they have a small motor neuron and fiber diameter, a high mitochondrial and capillary density, and a high myoglobin content.
What are 3 characteristics of Type 1 muscle fibers?
Type I fibers have low ATPase activity (at pH 9.4), are slow twitch, have high oxidative and low glycolytic capacity, and are relatively resistant to fatigue. Type IIA fibers have high myosin ATPase activity (pH 9.4), are fast twitch, have high oxidative and glycolytic capacity, and are relatively resistant to fatigue.
How do type 2X fibers differ from Type 2A and Type 1 muscle fibers?
Skeletal muscle fibers also vary in energy production. Type 1 and 2A fibers primarily use oxidative metabolism, and type 2X and 2B fibers primarily rely upon glycolytic metabolism.
What’s the difference between Type 2A and 2B muscle Fibres?
Intermediate-twitch type-2A: used when moving a semi-heavy object. Fast-twitch type-2B: the largest fibres, called into action when all-out effort is required (fight or flight). They contract many times faster than slow-twitch fibres and with much greater force, but they fatigue quickly.
What is a characteristic of a type 1 muscle fiber quizlet?
Type I- slow twitch muscle fibers are smaller in size, slower to fatigue, and produce long term contractions ( stabilization ).
What is a Type 1 Fibre?
Type 1: Slow oxidative (SO) fibers contract relatively slowly and use aerobic respiration (oxygen and glucose) to produce ATP. They produce low power contractions over long periods and are slow to fatigue.