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2.2 Animal tissues, organs and organ systems

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Question 73
F

A student writes that oxygen is pumped from the air in the alveoli into the blood. Which statement gives the best reason why the student is wrong?

[1]
A

oxygen moves against its concentration gradient across the alveolar wall

B

oxygen is carried in the blood plasma rather than in the red blood cells

C

oxygen moves down its concentration gradient without needing any energy

D

oxygen is used up by the cells of the alveolar wall as it passes through

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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

179 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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