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3.3 Maintaining internal environments

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Question 8
H

A person eats a meal that contains a lot of salt. The salt is absorbed into the blood, so the blood plasma becomes more concentrated.

a.

Explain the effect that more concentrated blood plasma would have on the body cells.

[2]
b.

Explain how the body responds to return the concentration of the blood plasma to normal.

[4]
c.

Some runners drink very large volumes of water during a long race. This can make the blood plasma too dilute.

Suggest why this can be dangerous for the brain.

[2]
Markscheme

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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