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7.1 Hormones and coordination

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Question 7

A doctor investigates a person whose blood thyroxine concentration is below normal. The doctor gives the person TRH. Blood TSH rises above normal and remains high, but blood thyroxine does not increase.

Which conclusion can be drawn from this response?

[1]
A

The pituitary responds to TRH, but the thyroid does not respond normally to the increased TSH.

B

The pituitary does not respond to TRH, but the thyroid responds normally to the increased TSH.

C

The thyroid responds directly to TRH, but the pituitary does not release TSH normally.

D

The pituitary and thyroid both respond normally, but TSH prevents thyroxine release.

Markscheme

7.1 Hormones and coordination Questions

  1. GCSE
  2. /Biology
  3. /7.1 Hormones and coordination

89 exam-style questions on Edexcel GCSE Biology 7.1 Hormones and coordination, covering 7.1.1 Endocrine glands and hormone transport, 7.1.2 Adrenalin and fight or flight, and 7.1.3 Thyroxine and negative feedback. Each one has a worked solution and a mark scheme showing where the marks go.

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