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2.2 Animal tissues, organs and organ systems

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Question 35

A person temporarily stops breathing, so the air in their alveoli is no longer refreshed. Oxygen continues to diffuse from the alveoli into the blood, but the rate decreases.

Which statement explains why?

[1]
A

the oxygen concentration in the alveoli falls, so the concentration gradient between the alveoli and the blood decreases

B

carbon dioxide builds up in the alveoli, so it blocks oxygen from passing through the alveolar walls

C

haemoglobin is used up as it binds to oxygen, so less oxygen can be carried away from the lungs

D

the active pumping of oxygen across the alveolar walls slows because the chest is no longer moving

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2.2 Animal tissues, organs and organ systems Questions

  1. GCSE
  2. /Biology
  3. /2.2 Animal tissues, organs and organ systems

304 exam-style questions on AQA GCSE Biology 2.2 Animal tissues, organs and organ systems, covering 2.2.1 The human digestive system, 2.2.2 The heart and blood vessels, 2.2.3 Blood, 2.2.4 Coronary heart disease: a non-communicable disease, 2.2.5 Health issues, 2.2.6 The effect of lifestyle on some non-communicable diseases, and 2.2.7 Cancer. Each one has a worked solution and a mark scheme showing where the marks go.

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