# Life Sciences Paper 1, November 2024, question 1.1.3

> A learner runs hard on the sports field and the carbon dioxide level in her... Marked mark by mark. Q1.1.3, Life Sciences Paper 1 November 2024, 2 marks.

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Last updated: 2026-11-12

Subject: Life Sciences. Source: Based on Nov 2024 · Paper 1 · Q1.1.3. Marks: 2. Not yet checked by a teacher.

## Question 1.1.3 (2 marks)

A learner runs hard on the sports field and the carbon dioxide level in her blood rises above normal. Which ONE of the following describes what happens in her body? Write only the letter.

- A: The breathing centre is stimulated by receptors in the diaphragm.
- B: The heart rate slows down and the breathing rate stays the same.
- C: Receptors in the carotid artery in the neck are stimulated.
- D: The rate and depth of breathing decrease.

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