quiz from 3-29 to 5-9-11

quiz from 3-29 to 5-9-11 - 3-29-11Afferent neurons carry...

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Unformatted text preview: 3-29-11Afferent neurons carry information from brain to muscle for the control of movement.1. true2. falseAt rest, the potential in the inside of the membrane is ___ the outside.1. more negative than2. more positive than3. about the same as At rest, the potential in the inside of the membrane is ___ the outside.1. more negative than2. more positive than3. about the same asAt equilibrium, when a neuron is at rest,1. the concentrations of K ions in both sides of the membrane are the same. 2. there is no K ions moving in and out.3. the concentration of K ions inside of the membrane is higher as compared to the outside.4-5-11There are more glia than neurons in the nervous system because glia perform multiple functions while neurons only conduct electrical impulses.1.true2.falseBecause there are ion channels that are open at rest, the plasma membrane is relatively leaky as compared to the insulated underwater cable.3.true4.falseWhy Na+ are not the major contributor to the Vrest at normal condition?1.Because there is no chemical gradient for Na+.2.Because the electrical gradient against Na+ influx.3.Because there is no Na+ channel in the membrane.4.Because the membrane permeability for Na+ is low. The plasma membrane acts as a ____, which means any change in the membrane potential would ___.1.Capacitor, change the amount of charges inside and outside of the membrane.2.Resister, slow down the charge movement across the membrane3.Conductor, move ions across the membrane4-7-11What would take for an action potential to generate?1.a local membrane depolarization2.a local membrane heperpolarization3.a change of the membrane potential to above the threshold potential4.a local circuit of currentThe raising phase of an action potential is resulted from:1.inactivation of the K leak channels,...
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This note was uploaded on 05/16/2011 for the course BIOLOGY 305 taught by Professor Weihong during the Spring '11 term at UMBC.

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quiz from 3-29 to 5-9-11 - 3-29-11Afferent neurons carry...

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