chp 7 quiz Flashcards
Astrocytes are NOT involved in ________.
breakdown and engulfment of foreign material in the CNS
The term “white matter” refers to ________.
myelinated axons in the CNS
The most numerous of all cells of CNS nervous tissue are the ________.
astrocytes
Which ion’s movement is responsible for repolarization?
outward diffusion of K+
If a cell’s membrane is not excitable, this means that ________.
the cell cannot vary the permeability of the membrane to specific ions
The membrane of resting nerve cells is more permeable to ________ ions than ________ ions.
potassium, sodium
Hyperpolarization in the postsynaptic cell is caused by ________.
Both inhibitory postsynaptic potentials and movement of K+ out of the cell are correct.
Neurotransmitter action could be prevented, or disrupted, if a drug or other agent ________.
blocked voltage-gated Ca2+ channels in the presynaptic membrane
Neurotransmitters ________.
bind to chemically-gated or ligand-gated channels
Acetylcholine ________.
can bind to nicotinic receptors
Acetylcholine can induce hyperpolarization by ________.
binding to muscarinic receptors
Muscarinic ACh receptors act through ________ activation of K+ channels.
G-protein
The ________ dopamine system may be involved in emotional reward and drug addiction.
mesolimbic
A patient is prescribed an MAO inhibitor by their doctor. Knowing the actions of MAO inhibitors, this patient’s diagnosis may be ________.
depression, since MAO inhibitors block the degradation of serotonin at the synapse
