BIOS 2400 Lecture Notes - Lecture 7: Resting Potential, Myelin, Axon Hillock
13 Mar 2017
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Mitochondria, neurotransmitters: retrograde transport: moves up the cell body; involves the motor protein dynein and its activator, dynactin; ex. In pns, myelin formation occurs by schwann cells wrapping around themselves. Ion channels: potassium (k+) channel: inhibitory; reversal potential -90 mv (hyperpolarize, sodium (na+) channel: excitatory; reversal potential +60 mv (depolarize, chloride (cl-) channel: inhibitory; reversal potential -60 to -70 mv (repolarize if at. 60, resting potential/polarized if at -70: calcium (ca++) channel: excitatory; reversal potential +50 mv (depolarize) Impulse jumps over sections of the fiber covered with insulating myelin: occurs at the nodes of. 7. 3 the synapse: synapse: functional connection between a neuron and the cell it is signaling. In the cns, this second cell will be another neuron. In the pns, the second cell will be in a muscle or gland; often called myoneural or neuromuscular junctions: synapses can be electrical or chemical (chemical = neurotransmitters)
