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2.2 Animal tissues, organs and organ systems

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Question 76

Sensors record the blood pressure in two vessels in a person's leg. The pressure is 12 kPa in an artery and 2 kPa in a vessel carrying blood back towards the heart. Nearby skeletal muscles squeeze this second vessel as the person moves.

Explain why valves are needed in the vessel carrying blood back towards the heart. Predict what could happen if one of its valves failed when the vessel was squeezed.

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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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