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Question 22N.2.SL.TZ0.b

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Date November 2022 Marks available [Maximum mark: 2] Reference code 22N.2.SL.TZ0.b
Level SL Paper 2 Time zone TZ0
Command term Outline Question number b Adapted from N/A
b.
[Maximum mark: 2]
22N.2.SL.TZ0.b

The diagram shows the release of a neurotransmitter across a synapse.

[Source: Splettstoesser T., 2015. SynapseSchematic [diagram online] Available at :
https://commons.wikimedia.org/w/index.php?curid=41349083 [Accessed 14 January 2023].]

Outline how the neuron is stimulated to release the neurotransmitter.

[2]

Markscheme
  1. the arrival of a nerve impulse/action potential/depolarization (stimulates the release of a neurotransmitter);
  2. depolarization stimulates calcium ion channels to open;
    OR
    calcium ions enter the presynaptic knob/button
  3. (calcium ions) cause the vesicle to fuse with / move to the membrane
    OR
    vesicles release neurotransmitter by exocytosis;

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