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3.2 Coordination and control – the endocrine system

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Question 22
H

A person does not have enough iodine in their diet. Their thyroid gland cannot make enough thyroxine. Their pituitary gland works normally. Which statement describes and explains the concentration of TSH in this person's blood?

[1]
A

TSH is lower than normal, because less thyroxine is being made.

B

TSH is lower than normal, because thyroxine stimulates TSH release.

C

TSH is higher than normal, because thyroxine stimulates TSH release.

D

TSH is higher than normal, because thyroxine is not inhibiting it.

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3.2 Coordination and control – the endocrine system Questions

  1. GCSE
  2. /Biology
  3. /3.2 Coordination and control – the endocrine system

84 exam-style questions on OCR GCSE Biology 3.2 Coordination and control – the endocrine system, covering 3.2.1 Principles of hormonal coordination and control, 3.2.2 Roles of thyroxine and adrenaline, 3.2.3 Hormones in human reproduction, 3.2.4 Interactions of reproductive hormones, 3.2.5 Hormones in contraception, 3.2.6 Hormones in reproductive technologies, 3.2.7 Plant hormones in growth and coordination, 3.2.8 Effects of plant hormones, and 3.2.9 Uses of plant hormones. Each one has a worked solution and a mark scheme showing where the marks go.

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