PHYSIOLOGY
SYNAPTIC PHYSIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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They contain large amounts of Mitochondria
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They are fast to fatigue
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They are recruited last
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They contain low numbers of Mitochondria
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Detailed explanation-1: -Slow-twitch muscle fibers are fatigue resistant, and focused on sustained, smaller movements and postural control. They contain more mitochondria and myoglobin, and are aerobic in nature compared to fast-twitch fibers.
Detailed explanation-2: -Slow twitch fibers are capable of sustaining long contractions and, consequently, contain a large number of mitochondria in order to obtain their (ATP) from aerobic metabolism.
Detailed explanation-3: -Slow-twitch fibers contain mitochondria, the organelles that use oxygen to help create adenosine triphosphate (ATP), which is the chemical that actually fuels muscle contractions, and are considered aerobic.
Detailed explanation-4: -Oxidative or “slow-twitch” fibers have slow contraction rates, high mitochondrial content, increased reliance on oxidative phosphorylation (OXPHOS), high resistance to fatigue, and high representation in postural muscles.
Detailed explanation-5: -The type 1 muscle fibres, slow oxidative, have a slow speed of contraction and a high resistance to fatigue. Their metabolism is oxidative and they have an increased concentration of myoglobin, which has an increased capacity to transport oxygen. They also have numerous mitochondria.