BIOL 1412 Lecture Notes - Sarcolemma, Hair Cell, Inner Ear
4 May 2014
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Most sensory neurons & motor neurons to skel. muscles: type c. Found in autonomic ns (ans) and some pain fibers. * comparison of gp and ap: (see table 11. 2) Graded potential (gp: location, strength of mp, summation, repolarization, types of gates dendrites/cell body variable. Na+ gates close; chemical, mechanical, thermal (i. e. not voltage) K+ gates open only voltage: distance travelled short (1-2 mm) & dies away produced anew on axon & propagates over long distances, refractory period. Present: synaptic transmission (st) at neuronal junction: (fig. Ns depends on chains of neurons connected by junctions called synapses. Receptors = chemically-gated ion channels open in response to nt: gated ion channels open - allowing movement of ions into (or out of) postsynaptic membrane (fig. Creates a graded potential (gp) called a postsynaptic potential (psp). (fig. * psps may be: excitatory psps (fig. Due to opening of na+ (or ca++) channels or closing ok k+ channels.
