BIPN 152 Lecture Notes - Lecture 2: Brainstem, Potassium Channel, Acetylcholine
1 Aug 2018
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Lecture 2, neuro3l, level 1: kindergartener, level 2: middle school, level 3: college level, nerve impulse, when neurons are excited, they create nerve impulses, which are transient changes in membrane potential, blips are nerve impulses. Positive correlation between stimulus intensity & nerve impulses: 2 basic principles, nerve impulses have a uniform size & shape (elementary unit) Increasing stimulus strength increased freq of nerve impulses (did not change. Ion concentrations during an action potential basically don"t change a lot: result of the movement of a miniscule number of na+ ions, 10mm [na+] -> 10. 006mm [na+] Selectivity filter: negatively-charged amino acids attract positively charged ions, what mechanism kicks off the depolarization, threshold for ap firing. Depolarization much reach a minimum level: at threshold = stocatically depolarizes. Sensory neuron senses and communicates impact: excitatory neuron sends signal to extensor muscle to extend leg.
