Read the following statement with two blanks (A and B).
_(A)_ muscle fibers are adapted for endurance-type activities such as marathon running. They are _(B)_. The one correct option for the two blanks is

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A-White;

B-Slow-twitch and fatigue-resistant

A-Red;

B-Slow-twitch and fatigue-resistant

A-White;

B-Fast-twitch and fatigue-prone

A-Red;

B-Fast-twitch and fatigue-resistant

answer is B.

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Detailed Solution

Red muscle fibres contain high myoglobin content, and plenty of mitochondria. They can utilise the large amount of oxygen stored in them for ATP production. Because they rely on aerobic respiration, they are fatigue-resistant (no lactic acid production). They have a slow speed of contraction (slow-twitch). They are capable of prolonged, sustained contractions for many hours. These fibres are adapted for maintaining posture and for aerobic, endurance-type activities like marathon running.

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