IB Biology SL 2.2.6 Synaptic transmission Question Bank

Practise IB Biology SL 2.2.6 by explaining how neurotransmitters transmit impulses across a synapse.

Exam points

Describe how neurotransmitters are released into the synaptic cleft.
Explain how neurotransmitters trigger a response in the postsynaptic neuron.

[Maximum number: 3]

The neuron is a specialized cell that exhibits a structure important to its function.

The diagram shows a neuron interacting with a muscle cell.

Figure for Question C2.2.6—Neurotransmitter release question 1 — IB Biology SL

Describe how neurotransmitters are released from a presynaptic neuron membrane.

a. action potential/nerve impulse reaches the end of the presynaptic neuron;

b. impulse/action potential/depolarization of the (presynaptic) membrane causes calcium (ions)/ $\mathrm{Ca}^{2+}$ uptake/diffusion into the neuron;

c. (calcium ions) cause vesicles to move to the (presynaptic) membrane;

d. vesicles contain neurotransmitter;

e. neurotransmitter released into the synaptic gap/cleft by exocytosis/when vesicle fuses with membrane;

3

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C2.2.6—Neurotransmitter release question 1