Cambridge IGCSE Biology practice

Paper 4 structured question: Anaerobic respiration

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Topic

Anaerobic respiration

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Paper 4Theory (Extended)2 marks

During intense exercise, muscles may not get enough oxygen and start producing lactic acid.

Description

When muscles work very hard, they produce lactic acid which accumulates in muscles and blood, causing an oxygen debt.

a
State what accumulates in muscles and blood during intense exercise.
Your answer
Aim for approximately 1 distinct marking point.
[1]
b
Identify what is meant by oxygen debt.
Your answer
Aim for approximately 1 distinct marking point.
[1]

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Paper 4Theory (Extended)2 marks

Description

Lactic acid accumulates in muscles and blood during intense exercise, causing muscle fatigue and an oxygen debt that must be repaid after exercise.

a
State what causes lactic acid to accumulate in muscles during intense exercise.
Your answer
Aim for approximately 1 distinct marking point.
[1]
b
State why oxygen debt occurs during intense exercise.
Your answer
Aim for approximately 1 distinct marking point.
[1]