The diagram shows a synapse. Label the structure indicated by the arrow that stores neurotransmitter molecules.

On the same diagram, label the synaptic cleft / synaptic gap.

Which structure in the pre-synaptic neurone provides energy (ATP) for recycling neurotransmitters?

What is the approximate width of the synaptic cleft?

Which of the following is found on the post-synaptic membrane?

State the function of mitochondria in the synaptic knob.

Identify the structure that neurotransmitter molecules bind to on the post-synaptic neurone.

Explain why there are many mitochondria in the pre-synaptic neurone but not in the post-synaptic neurone.

Describe the structure of a vesicle and state what it contains.

Suggest why the synaptic cleft is so narrow (approximately 20 nm).

A student observes a prepared slide of a synapse under a microscope at 400× magnification. The synaptic cleft measures 8 mm on the image. Calculate the actual width of the synaptic cleft. Show your working.

Compare the width of a typical axon (10 μm) with the width of the synaptic cleft (20 nm). How many times wider is the axon?

A scientist wants to investigate the number of vesicles in the pre-synaptic knob. Suggest a suitable method for counting vesicles.

In an experiment, a drug blocks receptor proteins on the post-synaptic membrane. Predict the effect on nerve impulse transmission.

Explain one safety precaution when using a microscope to observe prepared slides of nervous tissue.