Q: Which of the following equations correctly represents the conduction velocity ($$v) of a $$nerve fiber as a function of its diameter ($$d) $$and myelination?

$$v = k \times d ($$where $$k is a $$constant for myelinated fibers)

Q: Which equation best represents the relationship between stimulus intensity ($$I) $$and frequency of action potentials ($$f) in a $$sensory neuron?

$$f = k \times I ($$where $$k is a $$proportionality constant)

Question 1

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

Accepted Answer

They respond to potentially damaging stimuli by triggering pain.

Question 2

A patient experiences referred pain in the left arm during a heart attack. Which principle explains this phenomenon?

Accepted Answer

Visceral and somatic pain fibers travel along the same nerves, causing the brain to misinterpret the source.

Question 3

Which cranial nerve is responsible for transmitting visual information from the retina to the brain?

Accepted Answer

Optic nerve (II)

Question 4

Which of the following equations correctly represents the conduction velocity ($$v) of a $$nerve fiber as a function of its diameter ($$d) $$and myelination?

Accepted Answer

$$v = k 	imes d ($$where $$k is a $$constant for myelinated fibers)

Question 5

A patient has lost sensation in the skin over the lateral aspect of the forearm. Which spinal nerve dermatome is most likely affected?

Accepted Answer

C6

Question 6

Which of the following is NOT a component of a typical reflex arc?

Accepted Answer

Cerebral cortex

Question 7

During a stretch reflex, such as the knee-jerk reflex, which muscle group contracts and which relaxes?

Accepted Answer

Quadriceps contract; hamstrings relax

Question 8

Which type of sensory receptor is specialized to respond to chemical changes in the blood, such as changes in pH or CO$$_2$$ levels?

Accepted Answer

Chemoreceptors

Question 9

If a patient suffers a spinal cord injury that destroys all dorsal roots at the level of T4, which function will be most affected?

Accepted Answer

Sensory input from the skin over the chest

Question 10

Which of the following best describes the difference between monosynaptic and polysynaptic reflexes?

Accepted Answer

Monosynaptic reflexes involve only one synapse between a sensory and a motor neuron, while polysynaptic reflexes involve one or more interneurons.

Question 11

Which cranial nerve is primarily responsible for innervating the muscles of mastication?

Accepted Answer

Trigeminal nerve (V)

Question 12

A patient presents with loss of taste sensation in the anterior two-thirds of the tongue. Which cranial nerve is most likely damaged?

Accepted Answer

Facial nerve (VII)

Question 13

Which of the following statements about regeneration of nerve fibers is correct?

Accepted Answer

PNS axons can regenerate if the cell body is intact and Schwann cells are present.

Question 14

Which equation best represents the relationship between stimulus intensity ($$I) $$and frequency of action potentials ($$f) in a $$sensory neuron?

Accepted Answer

$$f = k 	imes I ($$where $$k is a $$proportionality constant)

Question 15

Which of the following best explains why destruction of a single spinal nerve does not usually result in complete numbness of a dermatome?

Accepted Answer

Most dermatomes overlap, so adjacent nerves can compensate for the loss.

Question 16

Which of the following is a correct sequence of events in a polysynaptic reflex arc?

Accepted Answer

Stimulus → sensory receptor → afferent neuron → integration center → efferent neuron → effector

Question 17

Which of the following best describes the crossed-extensor reflex?

Accepted Answer

It causes withdrawal of a threatened body part and extension of the opposite limb to maintain balance.

Question 18

Which type of receptor is most likely to be found in the retina of the eye?

Accepted Answer

Photoreceptor

Question 19

Which of the following best describes the role of the integration center in a reflex arc?

Accepted Answer

It processes sensory information and determines the appropriate response.

Question 20

A patient is unable to abduct their eye laterally. Which cranial nerve is most likely damaged?

Accepted Answer

Abducens nerve (VI)

Chapter 13: The Peripheral Nervous System (PNS) and Sensory Processing

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