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2.2 The challenges of size

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Question 3

A veterinary team recorded observations about the blood flowing through three blood vessels, P, Q and R, in a horse.

Blood vesselObservation
PBlood moves away from the heart in high-pressure surges.
QLow-pressure blood moves towards the heart and is prevented from flowing backwards.
RSubstances are exchanged between the blood and muscle cells.

Which option shows the vessel structures that match all three observations?

[1]
A

P has a thick wall and valves; Q has a thin wall and no valves; R has a wall one cell thick and a wide lumen.

B

P has a thick wall and no valves; Q has a thin wall and valves; R has a wall one cell thick and a very narrow lumen.

C

P has a thin wall and no valves; Q has a thick wall and valves; R has a wall one cell thick and a very narrow lumen.

D

P has a thin wall and valves; Q has a thick wall and no valves; R has a wall one cell thick and a wide lumen.

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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