Physio 2 Exam
All of the following are functions of astrocytes except:
produce myelin
provide physical support to axons
through tight cell junctions with capillaries, control movement of components from the blood to CNS tissue
uptake glucose from the capillary and chemically convert it into lactate for metabolic use by the CNS tissue
A sodium channel blocking medication would have the effect of:
making depolarization of a nerve cell less likely to occur
making the interior of a nerve cell more positive
making depolarization of a nerve cell more likely to occur
Oligodendrocytes are responsible for myelin production in the peripheral nervous system.
True
False
Grey matter of the brain is largely composed of myelin-containing axons, and is located in the deeper aspects of the cerebrum.
True
False
Movement of potassium out of the cell, or movement of chloride into the cell would have the effect of hyperpolarizing the cell.
True
False
The vast majority of cells in the CNS are axons.
True
False
Aceytlcholine is the primary inhibitory neurotransmitter of skeletal muscle motor neurons.
True
False
Serotonin is a critical neurotransmitter in voluntary muscle control, and is severely depleted in the symptomatic patients with Parkinson’s disease.
True
False
Sensory (afferent) neurons:
Transmit impulses to the CNS
Transmit impulses from the CNS to muscles and glands
Can transmit impulses to and from the CNS
Are ventral nerves
An action potential:
All are correct
Travels from the dendrites to cell body to axon to end feet
Depolarizes on the all or none principle
Is a positive feedback loop
Mylenated nerve fibers can:
Conduct impulses faster than non-mylenated nerve fibers
Conduct only motor impulses
Conduct only sensory impulses
All are correct
The myelin sheaths of the peripheral nervous system neurons are produced by:
oligodendrocytes.
ependymal cells.
leukocytes.
monocytes.
schwann cells.
Sensory nerves regulate muscle contraction.
True
False
Sensory neurons
are multipolar and carry impulses toward the CNS.
are bipolar and carry impulses away from the CNS.
are multipolar and carry impulses away from the CNS.
Which division of the nervous system innervates involuntary effectors?
autonomic nervous system
associative nervous system
somatic nervous system
The gap of exposed axon in the myelin sheath is the:
sheath of Schwann.
neurilemma.
node of Ranvier.
white matter.
The blood-brain barrier may prevent medications from reaching brain tissue.
True
False
During an action potential:
Na+ influx causes depolarization.
K+ influx causes after-hyperpolarization.
Na+ efflux causes depolarization.
K+ influx causes repolarization.
Chemicals that stimulate action potentials in postsynaptic cells are called :
neurotrophins.
neurotransmitters.
enzymes.
hormones.
Postsynaptic inhibition is caused by neurotransmitters that produce hyperpolarization.
True
False
The brain and spinal cord comprise the:
peripheral nervous system.
peripheral ganglia.
central nervous system.
spinal nerves.
Somatic motor neurons innervate involuntary effectors.
True
False
Myelinated axons transmit action potentials more rapidly than unmyelinated axons. True
True
False
{"name":"Physio 2 Exam", "url":"https://www.quiz-maker.com/QW6XVXGEK","txt":"All of the following are functions of astrocytes except:, A sodium channel blocking medication would have the effect of:, Oligodendrocytes are responsible for myelin production in the peripheral nervous system.","img":"https://www.quiz-maker.com/3012/images/ogquiz.png"}