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2.2 The challenges of size

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Question 7

A veterinary team records the pressure of blood in two vessels of a mammal. Vessel P carries blood from the lungs to the heart. Vessel Q carries blood from the heart to the body.

VesselPressure of blood
P10 mmHg
Q120 mmHg

Explain what the readings show about how blood is sent to the body.

Suggest how the pressure and flow of blood reaching the body tissues would be different if blood travelled straight from the lungs to the body without returning to the heart.

[4]
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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