Describe the sequence of events which allows information to pass from one neurone to the next neurone across a cholinergic synapse. (6 marks)
(1) An impulse causes calcium ions to enter the axon. (2) Vesicles fuse with the presynaptic membrane. (3) This causes the release of acetylcholine. (4) Acetylcholine diffuses across the synaptic cleft. (5) It binds with receptors on the postsynaptic membrane. (6) Sodium ions enter the neurone, causing depolarisation of the postsynaptic membrane. (7) If above threshold, a nerve impulse is produced.Note: there are 7 mark points for 6 available marks, if you put any 6 of the above you will get full marks!
Related Biology A Level answers
All answers ▸What are the main differences between RNA and DNA molecules?
Explain how blood glucose concentration is controlled in the body
A drug used in a scientific trial is a competitive inhibitor of the elctron transport chain in the light dependent reaction, what affect will this have on the amount of glucose synthesised by the plant? (4 marks)
Describe the light-dependent reactions of photosynthesis.