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BPK 205 (11)
Chapter 8

Ch.8b study guide questions

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Department
Biomedical Physio & Kines
Course
BPK 205
Professor
Parveen Bawa
Semester
Summer

Description
26 Take an unmyelinated neuron give all details to describe generation and conduction of an action potential from the trigger zone down to the terminals 23 pages with a figures 40 minutesThe axon in an unmyelinated neuron has much more capacity to hold the charge difference due to the small distance between the outside and the inside of the axon This large capacitance makes the required change in charge greater in order to generate an action potential Because more charge difference is required between outside and inside of the neuron the axon has less conductivity Action potentials will be much slower Also myelin sheath is there to protect from current leak In its absence there would be current leak further weakening the action potential signal This can result in Multiple Sclerosis However some neurons which have axons smaller than 1 micrometer in diameter benefit from being unmyelinated Conduction velocity for unmyelinated axons are proportional to the square root of the diameter of the axon At greater axon diameters myelinated axons conduct much faster27 Take an myelinated neuron give all details to describe generation and conduction of an action potential from the trigger zone down to the terminals23 pages with a figures 40 minutesMyelinated axons have nodes and internodes The unmyelinated nodes are where action potentials are created because that is where the Na ion channels are located Action potentials travel passively during the internodes which are myelinated The myelin gives the axons a greater diameter hence a lesser charge capacity The small capacitance allows action potentials to be cre
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