Nerve physiology First things first… Brain and cranial nerves lab practical See questions 2 and 3 on study guide 5 The nervous system: What does it do? Sensory perception of stimuli Integration Motor output Muscles or glands How is it organized? Central nervous system (CNS)
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exchange with capillaries
guide migrating young neurons
Clean up K+, neurotransmitters
Microglia: functions as clean-up
Substitute for immune systemWhat glial cells are in the CNS?
Most common (99%)
Three or more processes
Many dendrites, some no axon
Retina, olfactory mucosa
One process; divides into proximal and distal branches (both are considered axons)What kinds of neurons are there?
5. Na+ gates close (inactivate) above 0 mV
- voltage peaks around 35 mV
- fully depolarized
6. At voltage peak, K+ gates are finally fully open
- repolarization begins at K+ flows out
7. K+ gates closer more slowly than Na+ gates
- result: more K+ out than Na+ in
- overshoot = hyperpolarization