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2.2 Animal tissues, organs and organ systems

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Question 95
F

A blood clot blocks the blood supply to one part of a lung. Air still reaches the alveoli in that part, but gas exchange there stops. Which statement explains this?

[1]
A

the alveoli in that part collapse, so all of their surface area is lost

B

the walls of the alveoli in that part become more than one cell thick

C

oxygen is not carried away, so the concentration gradient falls to zero

D

air can no longer be replaced in the alveoli in that part of the lung

Markscheme

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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