EXAM IV True/False Flashcards
The all-or-none phenomenon as applied to nerve conduction states that the whole nerve cell must be stimulated for conduction to take place.
False
Reflexes are rapid, automatic responses to stimuli.
True
Efferent nerve fibers may be described as motor nerve fibers.
True
Cell bodies of sensory neurons may be located in ganglia lying outside the central nervous system
True
Myelination of the nerve fibers in the central nervous system is the job of the oligodendrocyte.
True
During depolarization, the inside of the neuron’s membrane becomes less negative.
True
Neurons in the CNS are organized into functional groups.
True
Strong stimuli cause the amplitude of action potentials generated to increase.
False
The oligodendrocytes can myelinate several axons.
True
Enkephalins and endorphins are peptides that act like morphine.
True
In myelinated axons the voltage-regulated sodium channels are concentrated at the nodes of Ranvier.
True
A postsynaptic potential is a graded potential that is the result of a neurotransmitter released into the synapse between two neurons.
True
Large-diameter nerve fibers conduct impulses much faster than small-diameter fibers.
True
nodes of Ranvier are found only on myelinated, peripheral neuron processes.
False
Unipolar neurons have axons structurally divided into peripheral and central processes.
True
