Select the correct difference between the leg muscles of a sprinter and those of a marathon runner.

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The sprinter’s muscles rely more on aerobic respiration

The sprinter’s muscles are more resistant to fatigue

The marathon runner’s muscles have more myoglobin

The marathon runner’s muscles have fewer mitochondria

answer is C.

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Detailed Solution

The slow-twitch, fatigue-resistant red muscle fibres are adapted for endurance-type activities such as running a marathon. Leg muscles of a marathon runner have more red muscle fibres (slow oxidative fibres) and hence more myoglobin.

Red muscle fibres (marathon runner)	White muscle fibres (sprinter)
More mitochondria	Fewer mitochondria
Resistant to fatigue	Prone to fatigue
More myoglobin content	Less myoglobin content
Rely more on aerobic respiration	Rely more on anaerobic respiration

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