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3.3 Maintaining internal environments

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Question 33
H

Which statement explains how vasodilation helps to cool the body?

[1]
A

Capillaries move closer to the skin surface, so the blood in them loses more heat to the air.

B

Vessels supplying skin capillaries narrow, so blood near the surface flows slowly and loses more heat.

C

Vessels supplying skin capillaries widen, so more blood flows near the surface and more heat is lost.

D

Vessels supplying skin capillaries widen, so more sweat is made and heat is lost by evaporation.

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3.3 Maintaining internal environments Questions

  1. GCSE
  2. /Biology
  3. /3.3 Maintaining internal environments

72 exam-style questions on OCR GCSE Biology 3.3 Maintaining internal environments, covering 3.3.1 Importance of a constant internal environment, 3.3.2 The skin and body temperature, 3.3.3 Insulin and blood sugar, 3.3.4 Glucagon and blood sugar, 3.3.5 Type 1 and type 2 diabetes, 3.3.6 Osmotic changes in body fluids, 3.3.7 Kidneys and water balance, 3.3.8 Structure of the kidney and tubule, 3.3.9 ADH and kidney tubule permeability, and 3.3.10 Responses to temperature and osmotic challenges. Each one has a worked solution and a mark scheme showing where the marks go.

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