Question

Which of the following is not the feature of red muscle fibres?

• A. They have plenty of mitochondria
• B. They have high content of myoglobin
• C. They have high amount of sarcoplasmic reticulum
• D. They are called aerobic muscles

Answer 1

The correct option is C They have high amount of sarcoplasmic reticulum

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. It contains plenty of mitochondria and less number of sarcoplasmic reticulum.
So, the incorrect statement is 'they have high amount of sarcoplasmic reticulum'.