Question

Aerobic muscles also called as :-

• A. Red fibres
• B. White fibres
• C. Grey fibres
• D. None of these

Answer 1

The correct option is A

Red fibres

The correct option is A.

Explanation of correct option:

1. Red fibers muscle contains an oxygen-storing pigment called myoglobin which gives them a reddish color. Therefore, they are called red fibers.
2. These muscles consist of plenty of mitochondria, which help utilize a large amount of oxygen stored in them for ATP production. Hence, also called aerobic muscles.
3. Red fibers muscles are supplied with plenty of blood capillaries. They do not accumulate lactic acid.
4. Example:- Extensor muscle in the human.

Explanation of incorrect options:

Option B

1. White Fibres have a lesser amount of myoglobin and contain a low amount of mitochondria, hence they appear whitish.
2. Fast swimming movements and escape reflexes require white muscles.
3. They are grouped in a helical form rather than parallel to the body axis and lay deeper in the body than the Red Muscles.
4. An example of a White Muscle is the eyeball Muscle.

Final Answer:- Aerobic muscles are also called Red Fibres.