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2.2 The challenges of size

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Question 20

A pressure sensor records the pressure in three structures at two consecutive moments during one heartbeat. Moment Q occurs after moment P.

MomentPressure in right atrium (kPa)Pressure in right ventricle (kPa)Pressure in pulmonary artery (kPa)
P0.80.31.6
Q0.43.22.4
a.

Name the valve between the right atrium and the right ventricle.

[1]
b.

Explain how the pressure data at moment P determine the position of both valves on the right side of the heart and the direction of blood flow.

[2]
c.

Explain how the pressure changes from moment P to moment Q cause blood to continue towards the pulmonary artery without returning to the right atrium.

[3]
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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