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7.1 Hormones and coordination

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Question 13
H

Adrenalin is removed from the blood quickly. Its concentration in the blood halves every 3 minutes.

Thyroxine stays in the blood for several days.

a.

The concentration of adrenalin in a person's blood is 4.0 arbitrary units. No more adrenalin is released.

Calculate the concentration of adrenalin in the blood after 9 minutes.

[2]
b.

Suggest one advantage of adrenalin being removed from the blood quickly.

[2]
c.

Suggest why it is an advantage that thyroxine stays in the blood for several days.

[2]
Markscheme

7.1 Hormones and coordination Questions

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

42 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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