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nerve signal+impulse
| Question | Answer |
|---|---|
| reflex arcs | nerve impulses conducted from receptors to effectors over neuron pathways/reflex arcs |
| conductions by a reflex arc | result in a reflex |
| reflex | contraction in a muscle or secretion by gland |
| simplest reflex arcs | 2-neuron arcs |
| 2- neuron arcs | consist of sensory neurons synapsing in spinal cord w motor neurons |
| 3- neuron arcs | consist of sensory neurons synapsing in spinal cord w interneurons that synapse w motor neurons |
| nerve impulse | self-propagating wave of electrical disturbance that travels along neuron membrane (action potential) |
| action potential | change in electrical potential associated w the passage of an impulse along the membrane of a muscle cell or nerve cell. |
| nerve impulse at rest | neuron membrane is slightly pos. on the outside -polarized- form slight excess sodium on outside |
| stimulus triggers opening of | sodium channels in plasma membrane |
| the inward movement of ______ does what to membrane | inward movement of sodium depolarizes membrane and when NA rushes in the membrane quickly returns to its polarized state |
| when one section of a membrane depolarizes... | the rest depolarize one at a time like dominoes down the whole membrane. |
| synapse | where impulses are transmitted from one neuron to another (postsynaptic neuron) |
| 3 parts of synapse | synaptic knob, synaptic cleft, plasma membrane |
| neurotransmitters | chemicals where neurons communicate |
Created by:
b.marshall