Biology · Organisms respond to changes in their environments

Skeletal muscles are stimulated to contract by nerves and act as effectors

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Question 1 of 35 · 3 parts, 6 marks0:00

An athlete performed a 10 second sprint, then rested. The concentration of phosphocreatine in a leg muscle was measured, shown as a percentage of the resting value.

(a)
Describe the changes in phosphocreatine concentration shown.
[2]
(b)
Explain why the phosphocreatine concentration falls during the sprint.
[2]
(c)
Explain why the phosphocreatine concentration rises again during recovery.
[2]

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