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8.3 Respiration

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Question 3
F

An athlete rested for 5 minutes, ran fast on a treadmill from 5 minutes to 15 minutes and then rested again.

The Figure shows the concentration of lactic acid in the blood of the athlete.

Figure

image

a.

Give the concentration of lactic acid in the blood of the athlete at rest.

[1]
b.

Calculate the percentage increase in the concentration of lactic acid between 5 minutes and 15 minutes.

[2]
c.

Explain why the concentration of lactic acid increased while the athlete was running.

[3]
d.

Give one effect of lactic acid building up in the muscles.

[1]
Markscheme

8.3 Respiration Questions

  1. GCSE
  2. /Biology
  3. /8.3 Respiration

42 exam-style questions on Edexcel GCSE Biology 8.3 Respiration, covering 8.3.1 Aerobic and anaerobic respiration. Each one has a worked solution and a mark scheme showing where the marks go.

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