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Nervous Tissue

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The period after an initial stimulus when a neuron is not sensitive to another stimulus is the ________.

A) depolarization
B) repolarization
C) absolute refractory period
D) resting period
C) absolute refractory period
Cell bodies of sensory neurons may be located in ganglia lying outside the central nervous system.
T/F
True
What type of stimulus is required for an action potential to be generated?

A) multiple stimuli
B) a suprathreshold stimulus
C) hyperpolarization
D) a threshold level depolarization
D) a threshold level depolarization
The all-or-none phenomenon as applied to nerve conduction states that the whole nerve cell must be stimulated for conduction to take place.
T/F
False
Neuroglia that control the chemical environment around neurons by buffering potassium and recapturing neurotransmitters are ________.

A) Schwann cells
B) oligodendrocytes
C) microglia
D) astrocytes
D) astrocytes
Axon diameter and degree of myelination determine nerve impulse conduction velocity.
T/F
True
Which part of the neuron is responsible for generating a nerve impulse?

A) dendrite
B) soma
C) axon
D) chromatophilic substance
C) axon
Which of the following is NOT a type of circuit?

A) pre-discharge circuits
B) diverging circuits
C) reverberating circuits
D) converging circuits
A) pre-discharge circuits
A neuron that has as its primary function the job of connecting other neurons is called a(n) ________.

A) glial cell
B) association neuron
C) afferent neuron
D) efferent neuron
B) association neuron
Efferent nerve fibers may be described as motor nerve fibers.
T/F
True
What does the central nervous system use to determine the strength of a stimulus?

A) size of action potentials
B) origin of the stimulus
C) type of stimulus receptor
D) frequency of action potentials
D) frequency of action potentials
The oligodendrocytes can myelinate several axons.
T/F
True
What are ciliated CNS neuroglia that play an active role in moving the cerebrospinal fluid called?

A) Schwann cells
B) astrocytes
C) oligodendrocytes
D) ependymal cells
D) ependymal cells
The __________ is due to the difference in K+ and Na+ concentrations on either side of the plasma membrane, and the difference in permeability of the membrane to these ions.

A) active potential
B) intermittent membrane potential
C) resting membrane potential
D) dendrite potential
C) resting membrane potential
Myelination of the nerve fibers in the central nervous system is the job of the oligodendrocyte.
T/F
True
Which neuroglia are the most abundant and versatile of the glial cells?

A) ependymal cells
B) Schwann cells
C) astrocytes
D) oligodendrocytes
C) astrocytes
Which of the choices below describes the ANS?

A) sensory and motor neurons that supply the digestive tract
B) motor fibers that conduct nerve impulses from the CNS to skeletal muscles
C) motor fibers that conduct nerve impulses from the CNS to smooth muscle, cardiac muscle, and glands
D) sensory neurons that convey information from somatic receptors in the head, body wall, and limbs and from receptors from the special senses of vision, hearing, taste, and smell to the CNS
C) motor fibers that conduct nerve impulses from the CNS to smooth muscle, cardiac muscle, and glands
The part of a neuron that conducts impulses away from its cell body is called a(n) ________.

A) neurolemma
B) Schwann cell
C) axon
D) dendrite
C) axon
Which of the following is NOT one of the basic functions of the nervous system?

A) monitor changes occurring both inside and outside the body
B) regulation of neurogenesis
C) integration of sensory input
D) control the activity of muscles and glands
B) regulation of neurogenesis
Collections of nerve cell bodies outside the central nervous system are called ________.

A) tracts
B) ganglia
C) nerves
D) nuclei
B) ganglia
Which of the following types of neurons carry impulses away from the central nervous system (CNS)?

A) sensory
B) association
C) afferent
D) motor
D) motor
Which of the following circuit types is involved in the control of rhythmic activities such as the sleep-wake cycle, breathing, and certain motor activities (such as arm swinging when walking)?

A) parallel after-discharge circuits
B) diverging circuits
C) converging circuits
D) reverberating circuits
D) reverberating circuits
The term central nervous system refers to the ________.

A) spinal cord and spinal nerves
B) brain, spinal cord, and peripheral nerves
C) peripheral and spinal nerves
D) brain and spinal cord
D) brain and spinal cord