3) Ciliated CNS neuroglia that play an active role in moving the
cerebrospinal fluid are called
A) ependymal cells B) Schwann cells
C) oligodendrocytes D) astrocytes
The sheath of Schwann is also called the ________.
A) myelin sheath
D) white matter
An excitatory neurotransmitter secreted by motor neurons innervating
skeletal muscle is
D) gamma aminobutyric acid
The period after an initial stimulus when a neuron is not sensitive
to another stimulus is the
A) resting period
D) absolute refractory period
Which of the following is not a structural feature of a neuron?
A) synaptic cleft
B) Nissl bodies
The part of a neuron that conducts impulses away from its cell body
is called a(n) ________.
D) Schwann cell
The point at which an impulse from one nerve cell is communicated to
another nerve cell is the
A) cell body
The role of acetylcholinesterase is to ________.
A) act as a transmitting agent
B) amplify or enhance the effect of ACh
C) destroy ACh a brief period after its release by the axonal endings
D) stimulate the production of serotonin
Which of the following is not a function of the autonomic nervous
A) innervation of smooth muscle of the digestive tract
B) innervation of cardiac muscle
C) innervation of glands
D) innervation of skeletal muscle
Collections of nerve cell bodies outside the central nervous system
are called ________.
The term central nervous system refers to the ________.
A) autonomic nervous system
B) brain, spinal cord, and peripheral nerves
C) brain and spinal cord
D) spinal cord and spinal nerves
The substance released at axon terminals to propagate a nervous
impulse is called a(n)
D) biogenic amine
A neuron that has as its primary function the job of connecting other
neurons is called a(n)
A) efferent neuron
B) afferent neuron
C) association neuron
D) glial cell
Saltatory conduction is made possible by ________.
A) the myelin sheath
B) large nerve fibers
C) diphasic impulses
D) erratic transmission of nerve impulses
The part of the neuron that normally receives stimuli is
A) an axon
B) a dendrite
C) a neurolemma
D) a Schwann cell
The sympathetic and parasympathetic are subdivisions of the ________.
A) central nervous system
B) voluntary nervous system
C) autonomic nervous system
D) somatic nervous system
Ependymal cells ________.
A) are a type of neuron
B) are a type of macrophage
C) are the most numerous of the neuroglia
D) help to circulate the cerebrospinal fluid
Neuroglia that control the chemical environment around neurons by
buffering potassium and
recapturing neurotransmitters are ________.
D) Schwann cells
Schwann cells are functionally similar to ________.
A) ependymal cells
Immediately after an action potential has peaked, which cellular
An inhibitory postsynaptic potential (IPSP) is associated with ________.
A) a change in sodium ion permeability
C) opening of voltage-regulated channels
D) lowering the threshold for an action potential to occur
Which of the following will occur when an excitatory postsynaptic
potential (EPSP) is being
generated on the dendritic membrane?
A) Specific sodium gates will open.
B) Specific potassium gates will open.
C) Sodium gates will open first, then close as potassium gates open.
D) A single type of channel will open, permitting simultaneous flow
of sodium and
When a sensory neuron is excited by some form of energy, the
resulting graded potential is
called a(n) ________.
A) postsynaptic potential
B) excitatory potential
C) action potential
D) generator potential
________ is an indolamine.