neurophysiology
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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Polarized | The inside is negatively charged with respect to the outside
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Repolarization | K+ channels open and K+ ions rush out of the cell, cell returns to resting potential (becomes more negative)
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Depolarization | Na+ channels open and Na+ ions rush into the cell, cell becomes less negative/ more positive
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Divergence | A single neuron sends impulses to many other neurons, amplifies an impulse
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Synapse | The junction between two communicating neurons
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Summation | Several sub-threshold impulses are combined to reach the threshold
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Facilitation | Sub-threshold stimulus causes the neuron to be more easily excited
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Convergence | a single neuron receives impulses from two or more axons, causes strong stimulation or inhibition
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Saltatory conduction | Nerve impulses 'jump' from node of Ranvier to node of Ranvier
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Inhibitory Neurotransmitter | Blocks an action potential in the post-synaptic neuron
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Excitatory Neurotransmitter | Increases post-synaptic membrane
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All-or-none response | If a neuron responds at all, it responds completely. Greater intensity of stimulation triggers more impulses per second, not stronger impulses
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Resting potential | A resting nerve is not being stimulated, has more potassium (K)+ ions inside, and more sodium (Na)+ ions outside. Inside has a more negative charge, outside has a more positive charge.
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Action potential | Na+ channels open, Na+ ions rush into cell. Interior becomes more positive. Na+ channels close. K+ channels open, K+ ions rush out of cell. Cell returns to resting potential/ more negative.
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Pre-synaptic neuron | The sending neuron (axon)
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Post-synaptic neuron | The receiving neuron (dendrites)
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Created by:
usillygoose93
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