KIN 270 Study Guide - Final Guide: Alpha Motor Neuron, Axon Hillock, Sliding Filament Theory
10 Feb 2016
School
Department
Course
Professor
Document Summary
T-tubule: rests on sr & uses electrical current to communicate. H-zone gets shorter and z-lines get closer in contraction. Myofibrils are made up of 6 proteins: actin- (thin filament, myosin- (thick filament) sticks to actin because it has its active site. Has z-lines which is a direct anchor for actin. Ca+ running down center of actin that allows myosin to directly connect to z-line: titin- support/non contractile elastic protein, nebulin- support/non contractile elastic protein. Resting potential: -70 mv on inside (lot of k+ inside, little inside), +10 mv outside (little na+ inside, lot outside). Graded potential: small stimuli, not enough to cause change in neuron, only a change in resting potential at axon hillock. Ap: chain reaction of charge swapping due to na+ channels opening one at a time along the axon causing a domino effect (+30 mv inside, -10 mv outside) Synaptic activity: small wave of potentials in the synaptic membrane.
