NEET BIOLOGY

Detailed explanation-1: -Red muscles are named so because they are dense with capillaries and are rich in myoglobin and mitochondria – which gives it a characteristic red appearance. On the other hand, white muscles have comparatively less mitochondria and are myoglobin poor, giving the muscles a “whitish” appearance.

Detailed explanation-2: -Unlike red muscle fibres, the white muscle fibres can contract faster and this is why they are called fast-twitch fibres. These muscles have low myoglobin and low oxygen content. White muscles therefore do not depend on oxygen for their energy but get it from glycogen.

Detailed explanation-3: -White fibers have less myoglobin than red fibers. White fibers have less mitochondria than red fibers.

Detailed explanation-4: -Type 1. Type I fibers (SO). These fibers have a rich capillary supply, numerous mitochondria and aerobic respiratory enzymes, and a high concentration of myoglobin.

Detailed explanation-5: -Myoglobin is an oxygen binding protein present in all muscle fibers. It is an airon-containing protein similar to haemoglobin and gives the muscle a reddish appearance. Red muscle fibres have abundant myoglobin while white muscle fibers have less myoglobin.