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Date November 2019 Marks available 2 Reference code 19N.3.HL.TZ0.22
Level Higher level Paper Paper 3 Time zone TZ0 / no time zone
Command term Identify Question number 22 Adapted from N/A

Question

Athletes taking growth hormones show an increase in their sprinting capacity. This is not maintained after discontinuing the drug. Suggest one reason for the disappearance of the effect.

[1]
a.

Distinguish between the mode of action of steroid hormones and peptide hormones.

[3]
b.

Identify with reasons whether the pituitary gland is an exocrine or endocrine gland.

[2]
c.

Markscheme

growth hormone/drug no longer present «in blood» OWTTE
OR
lack of hormones reduce «gained» muscle mass/strength ✔ 

a.

Award [1 mark] for each complete row, up to [3 max].
Apply ECF the second time plasma is omitted and award the mark.

b.

a. endocrine gland ✔

b. «ductless gland that» secretes hormones directly into the bloodstream ✔

c.

Examiners report

[N/A]
a.
[N/A]
b.
[N/A]
c.

Syllabus sections

Option D: Human physiology » Option D: Human physiology (Additional higher level topics) » D.5 Hormones and metabolism
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Option D: Human physiology » Option D: Human physiology (Additional higher level topics)
Option D: Human physiology

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