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7.1 Hormones and coordination

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Question 18

A small growth in a person's thyroid gland causes the gland to secrete more thyroxine than normal.

a.

State the effect of the increased thyroxine concentration on the person's metabolic rate.

[1]
b.

State the endocrine gland that releases TSH.

[1]
c.

The increased thyroxine concentration causes a decrease in TRH release.

Explain the effect of this decrease in TRH on TSH release.

[2]
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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