IB Biology SL C2.2.7 Excitatory Postsynaptic Potential Topic Practice

a. calcium/ $\mathrm{Ca}^{2+} / \mathrm{Ca}$ moves into the presynaptic membrane
OR
neurotransmitter/acetylcholine released from presynaptic membrane;
b. (neurotransmitter) diffuses across the synapse/synaptic cleft;
c. binds to transmembrane receptors/receptors in postsynaptic membrane;
d. (protein) channels open/ Na+ /positive ions diffuse in;
e. causes depolarization (of (post synaptic) membrane) / action potential / membrane potential increases;
3

Marking guidance:

max
Clarity of communication: [1]
The candidate's answers are clear enough to be understood without re-reading. The candidate has answered the question succinctly with little or no repetition or irrelevant material.