Difference Between Red and White Fibres MCQ - Practice Questions with Answers
Edited By admin | Updated on Sep 18, 2023 18:34 AM | #NEET
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5 Questions around this concept.
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MEDIUMWhich is not true for red fibres?
The number of mitochondria is few in them, but the amount of sarcoplasmic reticulum is high. What kind of muscle fibres are these?
Consider the following statements each with one or two blanks.
1) Repeated activation of the muscles can lead to the accumulation of A)__ due to anaerobic breakdown of glycogen in them, causing fatigue
2) The globular head of meromyosin is an active ATPase enzyme and has binding sites for B)___ and active sites for C)______
3) This central part of thick filament, not overlapped by thin filaments is called the D)____
Which one of the following options correctly fills the concerned blanks?
Concepts Covered - 1
Red and White Fibres
- Repeated activation of the muscles can lead to the accumulation of lactic acid due to anaerobic breakdown of glycogen in them, causing fatigue.
- Muscle contains a red coloured oxygen storing pigment called myoglobin.
- Myoglobin content is high in some of the muscles which give a reddish appearance.
- Such muscles are called the Red fibres.
- These muscles also contain plenty of mitochondria which can utilise a large amount of oxygen stored in them for ATP production.
- These muscles, therefore, can also be called aerobic muscles.
- On the other hand, some of the muscles possess very less quantity of myoglobin and therefore, appear pale or whitish.
- These are the White fibres.
- The number of mitochondria is also few in them, but the amount of sarcoplasmic reticulum is high.
- They depend on the anaerobic process for energy.
- Red muscle fibres contract slowly but stay contracted for a longer duration
- White muscle fibres contract rapidly but for a shorter duration
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