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2.2 Animal tissues, organs and organ systems

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Question 25

During a long race, a runner's leg muscles need a large supply of oxygen. Humans have a double circulatory system. Which statement describes an advantage of this system for the runner?

[1]
A

Blood is pumped to the lungs at high pressure, so it picks up oxygen more quickly

B

Blood flows slowly from the lungs to the muscles, giving more time for diffusion

C

Oxygenated blood reaches the leg muscles quickly, supporting a fast rate of respiration

D

Oxygenated and deoxygenated blood mix in the heart, so more blood reaches the muscles

Markscheme

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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