Chapter 15: Structure and Function of the Neurologic System

Chapter 15: Structure and Function of the Neurologic System

 

Complete Chapter Questions With Answers

 

Sample Questions Are Posted Below

 

MULTIPLE CHOICE

 

1. Which pathway carries sensory information toward the central nervous system (CNS)?

a.	Ascending	c.	Somatic
b.	Descending	d.	Efferent

 

 

ANS:  A

Peripheral nerve pathways can be afferent (ascending) pathways that carry sensory impulses toward the CNS. The remaining options do not carry sensory information to the CNS.

 

PTS:   1                    REF:   Page 448

 

2. Which type of axon transmits a nerve impulse at the highest rate?

a.	Large nonmyelinated	c.	Small nonmyelinated
b.	Large myelinated	d.	Small myelinated

 

 

ANS:  B

If the myelin layer is tightly wrapped many times around the axon and is forming the nodes of Ranvier, then conduction velocity increases and the neuron is referred to as myelinated. The increased diameter of the myelinated axons allows for the transmission of impulses at a faster rate. The other options do not affect nervous impulse transmission rates.

 

PTS:   1                    REF:   Pages 448-450

 

3. Which nerves are capable of regeneration?

a.	Nerves within the brain and spinal cord
b.	Peripheral nerves that are cut or severed
c.	Myelinated nerves in the peripheral nervous system
d.	Unmyelinated nerves of the peripheral nervous system

 

 

ANS:  C

Nerve regeneration is limited to only myelinated fibers and generally occurs only in the peripheral nervous system.

 

PTS:   1                    REF:   Pages 450-451

 

4. The neurotransmitter, norepinephrine, is secreted in the:

a.	Somatic nervous system	c.	Sympathetic postganglion
b.	Parasympathetic preganglion	d.	Parasympathetic postganglion

 

 

ANS:  C

Most postganglionic sympathetic fibers release norepinephrine (adrenaline). The remaining options do not reflect the correct site of norepinephrine secretion.

 

PTS:   1                    REF:   Pages 473-474

 

5. Both oligodendroglia and Schwann cells share the ability to:

a.	Form a myelin sheath	c.	Transport nutrients
b.	Remove cellular debris	d.	Line the ventricles

 

 

ANS:  A

The function of oligodendroglia (oligodendrocytes) is to deposit myelin within the central nervous system (CNS). Oligodendroglia are the CNS counterpart of Schwann cells. The remaining options are not reflective of the common function of these structures.

 

PTS:   1                    REF:   Pages 449-450