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8.3 Respiration

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Question 1

A scientist keeps living muscle fibres contracting by stimulating them at regular intervals.

PeriodNutrient solution around the muscle fibresObservation
1glucose and oxygen presentthe fibres continue to contract strongly
2glucose present but no oxygenthe contractions soon become weaker

Explain the differences in respiration during period 1 and period 2, and why the contractions become weaker during period 2.

In your answer, refer to:

  • the type of respiration
  • the breakdown of glucose
  • the supply of ATP
  • lactic acid
[6]
Markscheme

8.3 Respiration Questions

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

98 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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