Q. Branched nerve fibers that convey impulses toward the cell body of a neuron are called _____________.
A. axons
B. dendrites
C. axon collaterals
D. axon terminals
Answer- dendrites
Q. Myelin sheaths on the outsides of many axons are contributed by ______________.
A. the axon itself
B. secretory vesicles
C. Schwann cells
D. the cell bodies of the neuron
Answer- Schwann cells
Q. A neuron with many nerve fibers arising from its cell body and that carries impulses away from the brain would be classified as __________________.
A. multipolar
B. bipolar
C. unipolar and sensory
D. multipolar and motor
Answer- multipolar and motor
Q. Which types of neurons are likely to increase muscular activities?
A. accelerator neurons
B. inhibitory neurons
C. bipolar neurons
D. sensory neurons
Answer- accelerator neurons
Q. The _______________ are the types of neuroglial cells that provide myelin in the central nervous system.
A. astrocytes
B. oligodendrocytes
C. microglia
D. ependyma
Answer- oligodendrocytes
Q. Which type of neuroglial cells help regulate the composition of cerebrospinal fluid?
A. astrocytes
B. oligodendrocytes
C. microglia
D. ependyma
Answer- ependyma
Q. Cut neurons possess limited capabilities for regeneration. The type of neuroglial cell that aids regeneration by forming a regeneration tube to help reestablish the former connection is the _______________.
A. Schwann cell
B. astrocyte
C. microglial cell
D. ependymal cell
Answer- Schwann cell
Q. At resting potential, the ion distribution inside and outside of a neuron is such that __________ ions are most abundant on the outside of the cell, while __________ ions are most abundant on the inside of the cell.
A. potassium; sodium
B. sodium; potassium
C. calcium; phosphate
D. sulfate; potassium
Answer- sodium; potassium
Q. In response to a stimulus, if the membrane potential becomes more negative than the resting potential, we say the membrane is _______________.
A. hyperpolarized
B. depolarized
C. unpolarized
D. polarized
Answer- hyperpolarized
Q. When a neuron reaches action potential, it depolarizes and repolarizes in an amount of time on the order of ________________.
A. seconds
B. milliseconds
C. microseconds
D. nanoseconds
Answer- milliseconds
Q. Select the incorrect statement about nerve impulse conduction.
A. Saltatory conduction involves Schwann cells and occurs at greater speed than on unmyelinated fibers.
B. Nerve impulses occur in an all-or-none manner.
C. The neuron cannot be stimulated during the absolute refractory period.
D. The strength of impulses carried along a single nerve fiber can vary with the strength of their stimulus.
Answer- The strength of impulses carried along a single nerve fiber can vary with the strength of their stimulus.
Q. Excessive sleeping is most likely due to the presence of too much of which neurotransmitter?
A. GABA
B. norepinephrine
C. serotonin
D. dopamine
Answer- serotonin
Q. Myasthenia gravis reflects a deficiency in communication by _______________ because receptors for this neurotransmitter have been destroyed.
A. acetylcholine
B. norepinephrine
C. GABA
D. dopamine
Answer- acetylcholine
Q. The levels of which neurotransmitter are affected by the mood-elevator, cocaine?
A. serotonin
B. GABA
C. norepinephrine
D. acetylcholine
Answer- norepinephrine
Q. Fibers that originate from different parts of the nervous system and lead to the same neuron are exhibiting _____________.
A. facilitation
B. convergence
C. divergence
D. neuromodulation
Answer- convergence
Q. Which term does not belong with the others?
A. brain
B. spinal cord
C. CNS
D. spinal nerve
Answer- spinal nerve
Q. Which items should not be grouped together?
A. spinal nerve
B. cranial nerve
C. spinal cord
D. PNS
Answer- spinal cord
Q. The cells that conduct messages towards the brain are the:
A. motor neurons
B. sensory neurons
C. interneurons
D. neuroglia
Answer- sensory neurons
Q. Nerves impulses always travel to the brain through _____ fibers.
A. neuron
B. dendrite
C. nerve
D. axon
Answer- axon
Q. The myelin sheath around a neuron is actually produced by the:
A. neuron
B. axon
C. dendrite
D. Schwann cell
Answer- Schwann cell
Q. Which of these cells does not belong with the others?
A. microglia
B. neuron
C. astrocyte
D. oligodendroglia
Answer- neuron
Q. The _____ cells are capable of removing a blood clot from the brain.
A. astrocyte
B. oligodendrocyte
C. microglia
D. ependymal
Answer- microglia
Q. Which of these is true when a neuron is at rest?
A. the outside is positive
B. the outside is negative
C. there is no voltage
D. the inside is positive
Answer- the outside is positive
Q. The most common neurotransmitter in the body is _____.
A. serotonin
B. dopamine
C. acetylcholine
D. norepinephrine
Answer- acetylcholine
Q. Motor neurons receive impulses from the muscles in order to regulate glandular secretions.
A. TRUE
B. FALSE
C. Nothing can be said
D. None of the mentioned
Answer- FALSE
Q. The nucleus of a neuron is always located within the cell body region.
A. TRUE
B. FALSE
C. Nothing can be said
D. None of the mentioned
Answer- TRUE
Q. All neurons have at least one dendrite but one or more axons.
A. TRUE
B. FALSE
C. Nothing can be said
D. None of the mentioned
Answer- FALSE
Q. Motor neurons usually have a more complex structure than sensory neurons.
A. TRUE
B. FALSE
C. Nothing can be said
D. None of the mentioned
Answer- TRUE
Q. Impulses within a neuron always travel from the dendrite towards the axons.
A. TRUE
B. FALSE
C. Nothing can be said
D. None of the mentioned
Answer- TRUE
Q. The oligodendrocytes are capable of producing the myelin sheath that will wrap around a spinal nerve.
A. TRUE
B. FALSE
C. Nothing can be said
D. None of the mentioned
Answer- FALSE
Q. When a neuron is resting, the outside has more potassium ions than the inside.
A. TRUE
B. FALSE
C. Nothing can be said
D. None of the mentioned
Answer- FALSE
Q. The nodes of Ranvier function in slowing the conduction of the impulse.
A. TRUE
B. FALSE
C. Nothing can be said
D. None of the mentioned
Answer- FALSE
Q. The enzyme acetylcholinesterase acts to inhibit the stimulation between neurons.
A. TRUE
B. FALSE
C. Nothing can be said
D. None of the mentioned
Answer- TRUE