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Nervous system (Action potential (image (Depolarisation due to Na into the…
Nervous system
Action potential
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Permeability properties of membrane are changed and Na diffuses down conc gradient causing further depolarisation
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Depolarisation causes opening of K+ gates and diffusion out of cell which acts to restore original resting potential
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Cluster of Na will move from cell body in high concentration down axon toward axon terminal via diffusion due to higher conc in cell body to axon
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Graded Potentials
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Can be hyperpolarising - ie, inhibitory taking it further away from threshold
Structure of Nerve Cell
For diagram see pic
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Axon hillock important due to high concentration of ion channels and significant in generation of action potentials
Axon terminals contain neurotransmitters, which cross synaptic cleft.
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Membrane Potential
Intro
It is generated through unequal distributions of ions inside and outside of the cell creating a voltage difference
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Overview
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Afferent nervous system
Sensory Neurons
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Visceral – unconscious. E.g cramps, palpitations etc
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