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2.2 The challenges of size

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Question 17

Researchers use a harmless tracer to follow blood through the heart, lungs, leg muscles and blood vessels of a horse.

Which statement describes a result that would show the horse has a double circulatory system?

[1]
A

The tracer returns to the heart after leaving the lungs and before travelling to the leg muscles.

B

The tracer passes from the lungs to the leg muscles without returning to the heart.

C

Blood carrying the tracer from the lungs mixes in the heart with blood returning from the leg muscles.

D

The tracer stays inside blood vessels while travelling around the horse.

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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