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22 Cards in this Set
- Front
- Back
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specific
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ion channel that allows one specie of ion to pass
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volts
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how electricity is measured
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curare
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drug that binds receptors at neuromuscular junctions more tightly than ACH but doesn't cause ion gates to open
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ohms
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units of resistance to the flow of electricity
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action potential
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a threshold electrical currant on an excitable membrane characterized by depolarization due to Ca+ and Na+ followed by repolarization due to influx of K+
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non specific
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ion channels that allows more than one species of ion (Na+ and K+) to pass.
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All or none
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occurs at full intensity once a threshold stimulus is applied. Happens or doesn't
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botulinin
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toxin produced by clostridium butulinin. Binds to presynaptic knobs and prevents release of neuro transmitter.
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decrimental
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a response that fades or grows less intense as it moves away from stimulation
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acetylcholine
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neurotransmitter at all neuromuscular juncitons for skeletal muscles
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resistance
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anything that opposes the flow of electricity.
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excitable membrane
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can change its permeability to certain ions
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1. neural
2. muscle 3. gland |
three types of excitable membrane
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summation
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a post synaptic cell gives rise to a greater response "adding together".
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Synapse
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communication between membranes of 2 excitable cells via a neurotransmitter
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action potential
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electrical response that gives all or non effect and is propagated on axons and sarcolemma and T-tubes of muscle cells. non-decrimental
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graded potential
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change in electrical potential proportional to stimulus intensity
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threshold
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level of electrical stimulation (depolarization) that must be reached for an action potential to be generated.
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local circuit
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electrical flow along the membrane of an axon or muscle cell from the site of an action potential into adjacent areas and membrane
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amperes
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units of electrical flow
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resting membrane potential
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when membrane potential is unstimulated
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gated
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ion channels allow rapid changes in membrane potentials
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