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2.2 The challenges of size

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Question 33

A harmless tracer is injected into the vena cava of a mammal. The tracer passes through the right atrium and the right ventricle. It is then detected in vessel P, and after that in the capillaries around the alveoli.

The blood in vessel P has a low concentration of oxygen.

A student says that vessel P is a vein because the blood in it is deoxygenated.

Is the student correct? Explain your answer.

[2]
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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