Transmission Across a Synapse (AQA A-Level Biology): Flashcards

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Transmission Across a Synapse
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Synaptic cleft

Small gap between neurones

Neurotransmitters

Chemical messengers that allow nerve communication

Trigger for Ca2+Ca^{2+} channel opening at synapse

Action potential arrival at presynaptic neurone

Effect of Ca2+Ca^{2+} influx in synaptic knob

Causes vesicles to fuse with presynaptic membrane

Process releasing acetylcholine into cleft

Exocytosis

Effect of acetylcholine binding to Na+Na^+ channels

Opens sodium channels

What generates postsynaptic action potential

Na+Na^+ influx into postsynaptic neurone

Enzyme that breaks down acetylcholine

Acetylcholinesterase

Products of acetylcholine breakdown

Choline and ethanoic acid

Role of ATP in synaptic transmission

Recombines choline & ethanoic acid into acetylcholine

Explore AQA A-Level Biology Revision Notes by Topics

Response to Stimuli

Nervous Coordination

Skeletal Muscles

Homeostasis

Explore AQA A-Level Biology Model Answers by Topics

Response to Stimuli

Nervous Coordination

Skeletal Muscles

Homeostasis

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Response to Stimuli

Nervous Coordination

Skeletal Muscles

Homeostasis

Explore AQA A-Level Biology Exam Questions by Topics

Response to Stimuli

Nervous Coordination

Skeletal Muscles

Homeostasis

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