*NURSING > AQA QUESTION and MARK SCHEMES > 3.6.2 Synapses Questions And Answers Review Update A+ (All)

3.6.2 Synapses Questions And Answers Review Update A+

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(synapses) inhibitory neurotransmitters - ANS-hyperpolarise postsynaptic membrane so potential difference is more negative, preventing an action potential from firing / eg GABA opens Cl- channels ... so hyperpolarises membrane (synapses) synapse definition - ANS-a junction between neurones and effectors (synapses) process - ANS-action potential reaches pre-synaptic knob and triggers release of neurotransmitters from vesicles / diffuse across synaptic cleft to post-synaptic neurone or effector and bind to post-synaptic receptors where are converted back to action potentials in an excitatory response, or have desired response at effector (synapses) cholinergic synapses use - ANS-acetylecholine (ACh), which binds to cholinergic receptors and causes a cholinergic synapse (synapses) cholinergic synapses process - 1 arrival of action potential - ANS-action potential arrives at synaptic knob of presynaptic neurone, stimulating voltage-gated Ca2+ ion channels in presynaptic neurone to open / calcium ions diffuse into synaptic knob - are later pumped out via active transport [Show More]

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