1. Saltatory conduction is made possible by .

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BIOS 242

• Saltatory conduction is made possible by .
• large nerve fibers
• the myelin sheath
• biphasic impulses
• erratic transmission of nerve impulses

–Answer

• the myelin sheath
• Which part of the action potential occurs when the Na+ channels are inac- tivating and K+

channels open?

• depolarization
• repolarization
• resting state
• hyperpolarization

–Answer

• repolarization
• Which type of ion channel opens in response to changes in membrane potential?
• mechanically gated
• voltage-gated
• leakage
• chemically gated

–Answer

• voltage-gated
• The division of the autonomic nervous system has its ganglia near the spinal

column.

• thoracic
• parasympathetic
• somatic
• sympathetic

–Answer 1 / 4

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• parasympathetic
• A neuron that has as its primary function the job of connecting other neurons is

called a(n) .

• glial cell
• interneuron
• efferent neuron
• afferent neuron

–Answer

• interneuron
• Emptying of the bladder or rectum are examples of which type of reflex?
• withdrawal
• abdominal
• visceral
• plantar

–Answer

• visceral
• The somatic and autonomic nervous systems differ in all the following EXCEPT

.

• regulation of activity by higher brain centers
• their effectors
• target organ responses to their neurotransmitters
• their efferent pathways and ganglia

–Answer

• regulation of activity by higher brain centers
• Cranial nerve II, the optic nerve sends nerve impulses to the brain carrying information

about the things we see. These nerve fibers most likely belong to which division of the nervous system?

• parasympathetic division
• sensory (afferent) division
• sympathetic division
• somatic nervous system 2 / 4

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–Answer

• sensory (afferent) division
• Which neuroglia is functionally similar to an astrocyte, surrounding neuron cell bodies in

the PNS?

• satellite cells
• Schwann cells
• oligodendryocytes
• ependymal

–Answer

• satellite cells
• Activation of effector organs to produce a response describes .
• integration
• sensory input
• motor output
• none of the above

–Answer

• motor output
• Which of the following statements is correct concerning efferent pathways of the ANS?
• both pre-ganglionic and post-ganglionic fibers are shorter in the sympa- thetic system
• both pre-ganglionic and post-ganglionic fibers are longer in the sympathet- ic system
• sympathetic pre-ganglionic fibers are longer, while post-ganglionic fibers are shorter than

those of the parasympathetic system.

• sympathetic pre-ganglionic fibers are shorter, while post-ganglionic fibers are longer than

those of the parasympathetic system.–Answer D)sympathetic pre-gan- glionic fibers are shorter, while post-ganglionic fibers are longer than those of the parasympathetic system.

• Neuron cell bodies and nonmyelinated fibers make up the of the

CNS.

• white matter
• nodes of ranvier
• ganglia 3 / 4

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• gray matter

–Answer

• gray matter
• The peripheral nervous system contains .
• the spinal cord and spinal nerves

• 12 pairs of cranial nerves and 32 pairs of spinal nerves
• the brain and cranial nerves
• 12 pairs of cranial nerves and 31 pairs of spinal nerves

–Answer

• 12 pairs of cranial nerves and 31 pairs of spinal nerves
• Which of the following is a function of the myelin sheath?
• to decrease the speed of the nerve impulse
• to produce cerebrospinal fluid
• to protect and electrically insulate the axon
• phagocytize microorganisms

–Answer

• to protect and electrically insulate the axon
• Which of the following diseases is directly related to demyelination?
• multiple sclerosis
• cerebral palsy
• muscular dystrophy
• lupus

–Answer

• multiple sclerosis
• Which of these does NOT release acetylcholine?
• sympathetic pre-ganglionic fibers
• sympathetic post-ganglionic fibers
• parasympathetic pre-ganglionic fibers
• parasympathetic post-ganglionic fibers

–Answer

• / 4