synapse

Question 1

synapse structure

Answer 1

• mitochondria
• synaptic vesicles
• neurotransmitter
• synaptic cleft
• neuroreceptors in post-synaptic membrane
• wave of depolarisation- nerve impulses

Question 2

neurotransmitters

Answer 2

• chemical acetylcholine
• a chemical substance released from axon terminals at a synapse to carry impulses across the gap
• when impulses reach the terminal branches of axons they cause the vesicles to in the pre-synaptic membrane of the synaptic knob to burst (releasing the neurotransmitters which diffuse across the gap)
• the impulses cause a chemical process which stimulates receptors in the post-synaptic membrane to initiate nerve impulses

Question 3

importance of synapse

Answer 3

• flow of impulse is in one direction only
• dispersal of impulses to many other neurons
• they can filter out continual unnecessary or unimportant stimuli