BCS 240 Study Guide - Midterm Guide: Potassium Channel, Chemical Synapse, Reversal Potential

• School: University of Rochester
• Department: Brain and Cognitive Sciences
• Course: BCS 240
• Professor: Davis

Document Summary

K+ -80 dendrites axon initial segment axon ligand-gated voltage-gated voltage-gated types of channels event postsynaptic potential ions membrane cable properties. K+ and cl- increasing the diameter increases the length constant by increasing internal conductance postsynaptic potential summation/action potential generation. Na+ and k+ myelination shortens the time constant by decreasing membrane capacitance and conductance; myelination increases the length constant by decreasing membrane conductance. Gm is high in dendrites because they are unmyelinated and have a lot of leakage channels the closer you get to the soma length constant = (cid:3493)gi/gm time constant = cm/gm pre-synaptic terminal voltage-gated neurotransmitter release. Psp all-or-nothing slower constant amplitude (regenerate at every node of ranvier) shorter graded (amplitude is an integer multiple of the unitary psp) faster decremental (get smaller as they approach to soma due to leakage channels) longer. Exam 2 page 1 stages of voltage-gated channels: