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3.3 Maintaining internal environments

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Question 13
H

Which statement explains why it is important to keep the water potential of blood plasma constant?

[1]
A

A change stops enzymes being made in body cells, so metabolic reactions stop.

B

A change causes water to move into or out of body cells by osmosis, damaging them.

C

A change causes red blood cells to make more haemoglobin, so the blood thickens.

D

A change causes glucose to move into body cells by osmosis, so they respire too fast.

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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