Question 1

Which of the following best describes the function of mechanoreceptors in the peripheral nervous system?

Accepted Answer

They respond to touch, pressure, vibration, and stretch.

Question 2

A patient presents with left arm pain during a heart attack. This is an example of which phenomenon?

Accepted Answer

Referred pain

Question 3

Which structural class of sensory receptors is most likely to be found surrounding hair follicles and is responsible for detecting the bending of hairs?

Accepted Answer

Hair follicle receptors

Question 4

Which connective tissue layer directly surrounds individual axons and their myelin sheaths in a peripheral nerve?

Accepted Answer

Endoneurium

Question 5

During nerve regeneration in the PNS, what is the role of Schwann cells?

Accepted Answer

They engulf myelin fragments, secrete growth factors, and form a regeneration tube.

Question 6

Which equation best represents the graded potential generated by activation of a sensory receptor?

Accepted Answer

$$V_m = V_{rest} + \Delta V_{stimulus}$$

Question 7

Which of the following is NOT a function of proprioceptors?

Accepted Answer

Detecting chemical changes in blood

Question 8

Which type of nerve contains both sensory and motor fibers, allowing impulses to travel both to and from the CNS?

Accepted Answer

Mixed nerve

Question 9

A nerve injury occurs, and the axon distal to the injury degenerates. What is this process called?

Accepted Answer

Wallerian degeneration

Question 10

Which of the following is TRUE regarding the regeneration of nerve fibers in the CNS?

Accepted Answer

Oligodendrocytes bear growth-inhibiting proteins that prevent regeneration.

Question 11

Which receptor type is most likely to be activated by temperatures outside the range of 10–48ºC?

Accepted Answer

Nociceptors

Question 12

Which of the following best describes the circuit level of neural integration in the somatosensory system?

Accepted Answer

Processing in ascending pathways

Question 13

Which equation would you use to calculate the conduction velocity ($$v) of a $$nerve fiber given the distance ($$d) $$and time ($$t) $$for an impulse to travel?

Accepted Answer

$$v = \frac{d}{t}$$

Question 14

Which of the following is a characteristic of encapsulated dendritic endings?

Accepted Answer

They are mechanoreceptors encased in connective tissue capsules.

Question 15

A patient is unable to perceive light touch on their fingertips. Which receptor is most likely damaged?

Accepted Answer

Tactile (Meissner’s) corpuscles

Question 16

Which of the following best explains why visceral pain is often perceived as coming from a somatic region?

Accepted Answer

Visceral and somatic pain fibers travel along the same nerves.

Question 17

Which equation would you use to estimate the number of axon filaments ($$N) $$growing through a regeneration tube if the rate of growth ($$r) $$and time ($$t) $$are known?

Accepted Answer

$$N = r \cdot t$$

Question 18

Which of the following is NOT a function of the somatosensory system?

Accepted Answer

Generating motor output for voluntary movement

Question 19

Which of the following best describes the function of the perineurium in a nerve?

Accepted Answer

It bundles fibers into fascicles.

Question 20

Which of the following is TRUE regarding ganglia in the peripheral nervous system?

Accepted Answer

Ganglia associated with afferent nerve fibers contain cell bodies of sensory neurons.

ch. 13 part A; Peripheral Nervous System: Structure, Function, and Sensory Processing

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