Neuromuscular Junctions (AQA A-Level Biology): Flashcards
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Neuromuscular junction
Neuromuscular junction
Specialised connection where motor neurone meets skeletal muscle fibre
Motor unit
Motor unit
All muscle fibres supplied by a single motor neurone
Neurotransmitter at neuromuscular junction
Neurotransmitter at neuromuscular junction
Acetylcholine
Enzyme that breaks down acetylcholine
Enzyme that breaks down acetylcholine
Acetylcholinesterase
Effect of neuromuscular junction
Effect of neuromuscular junction
Only excitatory
Structures linked by neuromuscular junction
Structures linked by neuromuscular junction
Motor neurones to skeletal muscles only
Synaptic cleft
Synaptic cleft
Narrow gap where neurotransmitter diffusion occurs
Motor units activated in light movements
Motor units activated in light movements
Only a few motor units
Motor units activated in powerful movements
Motor units activated in powerful movements
Many motor units stimulated simultaneously
Location of acetylcholine receptors
Location of acetylcholine receptors
On postsynaptic membrane (muscle fibre membrane)