1.) ____ of the neuron experience(s) resting membrane potential
because of the presence of ____ that are the dominant contributors
to the process.
A. Dendrites, pumps
B. Soma, ligand-gated channels
C. Axon, voltage-gated channels
D. Terminals, receptors
E. All regions, leak channels
2.) Glia provide supportive nervous system functions such
that:
A. Ependymal cells provide immune responses
B. Microglia circulate CSF
C. Oligodendrocytes regulate substances entering the brain from
capillaries
D. Schwann cells myelinated axons in the spinal
cord
E. Astrocytes perform signal cessation by absorbing
neurotransmitter
3.) Resting membrane potential:
A. Sits close to potassium equilibrium potential because
potassium voltage-gated channels are more numerous than sodium
non-gated channels
B. Utilizes high levels of energy because it is mainly
established by the Na/K ATPase
C. Is a result of high intracellular sodium and large anionic
proteins
D. Produces an electrochemical gradient that favors sodium
efflux through voltage-gated channels because of its large driving
force
E. No option is correct
4.) Flow of potassium across a typical neuron embrace
leads to ____ events that move the neuron ____ threshold, while
____ has the opposite response.
A. EPSP... toward... sodium
B. IPSP... away from... calcium
C. Negative feedback... directly to... protein
D. Positive feedback... closer to... chloride
E. No option is correct
5.) Positive feedback occurs when a factor ____. An example
happens during ____, which involves the ion ____ and an off-switch
called ____.
A. Continually decreases... resting repolarization phase...
potassium... channel inactivation
B. Reverses itself... action potential depolarization phase...
potassium... channel closing
C. Continually increases... action potential depolarization
phase... sodium... channel inactivation
D. Moves toward homeostasis... synaptic
transmission depolarization phase... calcium... channel
activation
E. No option is correct
6.) Match the letter with the statement, some may require
more than one.
A. Rest B. Depolarization C. Repolarization D.
Hyperpolarization
____ 1. Mediated by voltage-gated channels
____ 2. Requires sodium influx
____ 3. Phase of action potential
____ 4. Occurs when potassium channels close
____ 5. Involves a positive feedback loop