Question

Which is not true about red fibres?

• A. Muscles contain a red coloured oxygen storing pigment
• B. Muscles contain plenty of mitochondria
• C. They are also called aerobic muscles
• D. Amount of sarcoplasmic reticulum is high

Answer 1

The correct option is D Amount of sarcoplasmic reticulum is high

• Muscle is a bundle of fibrous tissue that has the ability to contract, producing movement and maintaining the position of parts of the body.
• The total number of muscles in the human body comes in the range of 640-850.
• Muscles appear red in colour due to a pigment called myoglobin. Myoglobin is a red coloured oxygen-storing pigment. It receives oxygen from the red blood cells and transports it to the mitochondria of muscle cells, where the oxygen is used in cellular respiration to produce energy. Hence red muscles are also called aerobic muscles.
• Except statement D all other statements are characteristics of red fibres.
• Hence the correct option is D.