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10 Cards in this Set
- Front
- Back
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Characteristics of AP
- amplitude, intensity, speed |
amplitude is constant
intensity reflects frequency speed propogation determined by myelination and axon diameter |
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Difference between CNS and PNS axons
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CNS all myelinated, PNS not necessarily
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nuclei vs. ganglia
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nuceli - soma in CNS
ganglia - soma in PNS |
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Role of Ca2+ in synaptic transmission and how is it released?
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binds to regulatory proteins causing exocytosis of vesicles after presynaptic membrane depolarized and VG Ca2+ channels are opened resulting in influx
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What is the neuronal RMP controlled by? (2)
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Na+/K+ ATPase and K+ leak channels
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Absolute refractory period
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no new AP will result, as VG Na+ channels are inactivated; and will only return to normal closed state once cell is repolarized
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What determines whether NT is excitatory or inhibitory and how do they work?
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its effect on the post synaptic membrane; through ligan gated ion channels
depolarize = excitatory hyperpolarize = inhibitory |
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Adaptation of sensory receptors
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respond not to stimulus, but rather change in stimulus
if intensity remains constant, then decrease in firing frequency |
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bone conductance
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ability to hear caused by vibration of skull bones transferring to cochlea
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What makes a Portal System unique?
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hypothalamic pituitary and hepatic
only locations where once blood enters capillaries, doesn't return to heart but there are two communicating capillary beds |
