Biology 9700 · AS & A Level · Control and coordination in mammals

Control and coordination in mammals — practice question

Nerve impulses must cross synapses. Table 1.1 sets out the steps that allow a nerve impulse to pass across a cholinergic synapse. The steps are not in the correct sequence.
(a)[4]

Finish Table 1.2 so that the events appear in the correct sequence. Two of the events have already been completed for you.

(b(i))[2]

Explain how synapses make nerve impulses travel in one direction only.

(b(ii))[2]

During a learning activity, it is thought that the number of synapses between neurones rises. Suggest the advantages of this larger number of synapses.

(ii)[2]

During a learning activity, it is thought that the number of synapses between neurones rises. Suggest the advantages of this larger number of synapses.

Worked solution & mark scheme

This 10-mark question has a full step-by-step worked solution and mark scheme. One marking point: “The stages in the correct sequence are: E, H, A, J, C, F, B, G, D, I” …

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