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2.2 The challenges of size

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Question 25
H

Mammals have a double circulatory system. Fish have a single circulatory system.

Which statement explains an advantage of a double circulatory system?

[1]
A

Blood passes through the lungs twice, so it collects more oxygen on each circuit.

B

Blood flows more slowly to the body, so there is more time for exchange in tissues.

C

Oxygenated blood mixes with deoxygenated blood, so all cells receive some oxygen.

D

Blood is pumped again after the lungs, so it reaches the body at a high pressure.

Markscheme

2.2 The challenges of size Questions

  1. GCSE
  2. /Biology
  3. /2.2 The challenges of size

114 exam-style questions on OCR GCSE Biology 2.2 The challenges of size, covering 2.2.1 Exchange surfaces and surface area : volume ratio, 2.2.2 Substances transported in organisms, 2.2.3 The human circulatory system, 2.2.4 The heart and blood vessels, 2.2.5 Red blood cells and plasma, 2.2.6 Uptake of water and mineral ions by plants, 2.2.7 Transpiration and translocation, 2.2.8 Xylem and phloem, 2.2.9 Environmental factors and water uptake, and 2.2.10 Using a potometer. Each one has a worked solution and a mark scheme showing where the marks go.

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