DP Chemistry (last assessment 2024)

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Question 19N.3.sl.TZ0.c

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Date November 2019 Marks available [Maximum mark: 1] Reference code 19N.3.sl.TZ0.c
Level sl Paper 3 Time zone TZ0
Command term Outline Question number c Adapted from N/A
c.
[Maximum mark: 1]
19N.3.sl.TZ0.c

Body fluids have different pH values.

Outline how ranitidine reduces stomach acidity.

[1]

Markscheme

blocks/binds to H2-histamine receptors «in cells of stomach lining»
OR
prevents histamine molecules binding to H2-histamine receptors «and triggering acid secretion»
OR
prevents parietal cells from releasing/producing acid ✔

NOTE: Do not accept “antihistamine” by itself.
Accept “H2-receptor antagonist/H2RA” OR “blocks/inhibits action of histamine”.
Accept “blocks receptors in parietal cells «from releasing/producing acid»”.
Do not accept “proton pump/ATPase inhibitor”.

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