Nervous Tissue Question Preview (ID: 44560)
Nervous Tissue.
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These ion channels respond primarily to neurotransmitters (chemicals).
a) Voltage.
b) Leakage.
c) Ligand.
d) All of these
The resting membrane potential of a neuron is __________ and the action potential “thresh-hold” is _______ .
a) –70, -55
b) –55, -70
c) –55, +30
d) None of these
During the depolarization phase of an action potential, which of the following is the primary activity?
a) Potassium ions are flowing out of the cell.
b) Potassium ions are flowing into the cell.
c) Sodium ions are flowing out of the cell.
d) Sodium ions are flowing into the cell.
Of the characteristics listed, the factor most affecting the rate and speed of impulse conduction is:
a) length of the axon.
b) presence or absence of a myelin sheath (insulation).
c) number of neuroglia associated with it.
d) site of initial stimulation.
A neuron that has its primary function of connecting other neurons is:
a) association neuron
b) efferent neuron
c) afferent neuron
d) glial cell
This structure of the neuron carries impulses away from the cell body.
a) Dendrite
b) Hillock
c) Axon
d) Neurolemma
Schwann cells are found in the CNS.
a) True
b) False
c)
d)
Ciliated CNS neuroglia that play an active role in moving the cerebrospinal fluid are:
a) Ependymal cells
b) Schwann cells
c) Microglia
d) Oligodendrocytes
continuous is faster than saltatory nervous conduction
a) True
b) False
c)
d)
The part of the nervous system that is voluntary and conduct impulses from the CNS to the skeletal muscles is the:
a) somatic nervous system
b) autonomic nervous system.
c) enteric nervous system.
d) sensory nervous system
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