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3.3 Maintaining internal environments

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Question 7
F

The temperature inside the human body is kept close to 37 ∘C37\ ^\circ\text{C}37 ∘C.

Which statement explains why?

[1]
A

so that the blood can carry more oxygen around the body to all of the cells

B

so that the cells do not need to respire to release energy to heat the body

C

so that enzymes work at a suitable rate for the metabolic reactions in cells

D

so that the cells in the body do not lose too much of their water in sweat

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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