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2.2 Animal tissues, organs and organ systems

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Question 35

During prolonged standing, blood in the veins of the lower legs returns towards the heart at low pressure. The valves in these veins are damaged.

Which statement explains a possible effect of this damage?

[1]
A

Blood may flow faster towards the heart, because the valves no longer narrow the vein

B

The thick muscular vein walls may pump the blood upwards, so its return stays normal

C

Blood may carry more oxygen because it stays in the lower legs for longer

D

Blood may flow backwards between muscle squeezes, reducing the return of blood to the heart

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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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