$$\text{Action Potential occurs if Graded Potential} \geq \text{Threshold}$$

$$\text{Impulse Frequency} \propto \text{Stimulus Strength}$$

Question 1

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

Accepted Answer

They respond to pressure and touch stimuli.

Question 2

A patient presents with an inability to close their eyelid and drooping of the mouth corner. Which cranial nerve is most likely affected?

Accepted Answer

Cranial Nerve VII (Facial)

Question 3

Which equation best represents the relationship between graded potential and action potential generation in sensory neurons?

Accepted Answer

$$	ext{Action Potential occurs if Graded Potential} \geq 	ext{Threshold}$$

Question 4

Which of the following is TRUE regarding the adaptation of sensory receptors?

Accepted Answer

Adaptation refers to a decrease in sensitivity during constant stimulation.

Question 5

A herniated disc compresses the femoral nerve. Which symptom is most likely to occur?

Accepted Answer

Problems with walking gait due to impaired thigh flexors.

Question 6

Which cranial nerve is responsible for transmitting sensory information about smell?

Accepted Answer

Cranial Nerve I (Olfactory)

Question 7

Which of the following best describes the pathway of a somatic reflex?

Accepted Answer

Stimulus → Receptor → Sensory neuron → Integration center → Motor neuron → Effector

Question 8

Which nerve innervates the diaphragm and is essential for breathing?

Accepted Answer

Phrenic nerve

Question 9

Which of the following is a mixed nerve that provides motor innervation to chewing muscles and sensory information from the skin of the face?

Accepted Answer

Cranial Nerve V (Trigeminal)

Question 10

Which equation best represents the relationship between impulse frequency and stimulus strength?

Accepted Answer

$$	ext{Impulse Frequency} \propto 	ext{Stimulus Strength}$$

Question 11

Damage to which cranial nerve would most likely result in difficulty swallowing and loss of taste sensation from the posterior third of the tongue?

Accepted Answer

Cranial Nerve IX (Glossopharyngeal)

Question 12

Which of the following nerves is formed from the ventral rami of C5-C8 and T1 and innervates the upper limb?

Accepted Answer

Brachial plexus

Question 13

Which of the following best describes the function of the dorsal root of a spinal nerve?

Accepted Answer

It contains sensory fibers that arise from sensory neurons in the dorsal root ganglia.

Question 14

Which cranial nerve is primarily responsible for hearing and balance?

Accepted Answer

Cranial Nerve VIII (Vestibulocochlear)

Question 15

Which of the following is TRUE regarding referred pain?

Accepted Answer

It is pain originating in internal organs but felt on the body surface.

Question 16

Which nerve is most likely to be injured in a wrist-slashing suicide attempt, resulting in difficulty with pincher grasp?

Accepted Answer

Median nerve

Question 17

Which of the following best describes the function of proprioceptors?

Accepted Answer

They detect stretch in muscles, joints, tendons, and ligaments.

Question 18

Which equation best represents the process of nerve impulse transmission in the presence of a constant stimulus?

Accepted Answer

$$	ext{Adaptation} = \frac{	ext{Change in Sensitivity}}{	ext{Constant Stimulus}}$$

Question 19

Which of the following nerves innervates the muscles of facial expression and glands such as tear and saliva glands?

Accepted Answer

Cranial Nerve VII (Facial)

Question 20

Which of the following best describes the clinical significance of abnormal reflexes?

Accepted Answer

They indicate that the nervous system is damaged.

Chapter 13: The Peripheral Nervous System – Structure, Function, and Clinical Relevance

Study Guide - Practice Questions