A) Both the muscles are called aerobic muscles.
B) Both the muscles are called red fibres and depend on aerobic process for energy.
C) Muscle 1 is called white fibres and whereas muscle 2 depends on aerobic process for energy.
D) Muscle 1 is called red fibres and aerobic muscles whereas muscle 2 is called white fibres and depend on anaerobic process for energy.
Correct Answer: D
Solution :
[d] Muscle 1 and 2 are respectively red muscle fibre and white muscle fibre. Red muscle fibre (or Type I, slow twitch muscle fibre) is dense with capillaries and is rich in mitochondria and myoglobin, giving the muscle tissue its characteristic red colour. It can carry more oxygen and sustain aerobic activity using fats or carbohydrates as fuel. Slow twitch fibres contract for long periods of time but with little force. White muscle fibre (or Type II, fast twitch muscle fibre) contract quickly and powerfully but fatigue very rapidly, sustaining only short, anaerobic bursts of activity before muscle contraction becomes painful. They contribute most to muscle strength and have greater potential for increase in mass. Type II is anaerobic, glycolytic, "white" muscle that is least dense in mitochondria and myoglobin.
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