PSYC 3307 Lecture Notes - Lecture 8: Chemical Synapse, Exocytosis, Sensory Cortex
25 Jul 2020
School
Department
Course
Professor
Document Summary
To support ionic movements associated with all action potential production. * the second is a better time unit for considering aps . Therefore the cost of ion pumping in one cortical neuron. = 6. 7 x 1018 atp molecules divided by the estimated number of cortical neurons (1. 9 x 1010 ) = Synapses / mm3 of cortex: 7 x 108. Assuming a 50% failure rate, the cost of epsps arising from a single action potential = C) cost of propagating an action potential in dendrites and soma. In dendrites and soma = 1. 4 x 108 atp/neuron. # 2. 5 times more than in rodents. D) cost of propagating an action potential along an unmyelinated axon. Average neuron has 100mm of intracortical* axon. Avg. propagation cost along axons = 7. 9 x 108 atp. 2. 3 x 104 atp molecules per vesicle released. Assuming a 50% failure rate on 17,500 synapses / neuron the energy cost = 2 x 108.
