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Which is not true for red fibres?
Option: 1
Muscles contain a red coloured oxygen storing pigment
Option: 2
Muscles contain plenty of mitochondria
Option: 3
They are also called aerobic muscles
Option: 4
Amount of sarcoplasmic reticulum is high
Answers (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
-
Sarcoplasmic reticulum is high in red muscle fibres. Hence the correct option is d
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