Question 1

Which of the following best describes the function of proprioceptors?

Accepted Answer

They sense body position and movement, found in muscles and joints.

Question 2

A patient presents with loss of sensation in the lateral forearm. Which nerve is most likely affected?

Accepted Answer

Musculocutaneous nerve

Question 3

Which cranial nerve is responsible for the sense of equilibrium and hearing?

Accepted Answer

Vestibulocochlear nerve (VIII)

Question 4

During a heart attack, pain is often felt in the left arm or jaw. This phenomenon is known as:

Accepted Answer

Referred pain

Question 5

Which of the following is TRUE regarding the regeneration of nervous tissue?

Accepted Answer

PNS axons can regenerate with the help of Schwann cells forming a regeneration tube.

Question 6

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

Accepted Answer

Cerebellum

Question 7

A patient has difficulty swallowing and loss of taste in the posterior third of the tongue. Which cranial nerve is most likely damaged?

Accepted Answer

Glossopharyngeal nerve (IX)

Question 8

Which spinal nerve plexus is responsible for innervating the diaphragm?

Accepted Answer

Cervical plexus

Question 9

Which of the following best describes sensory adaptation?

Accepted Answer

Sensory receptors reduce their sensitivity to a constant stimulus.

Question 10

Which equation best represents the threshold for action potential generation in a sensory neuron?

Accepted Answer

$$ \sum V_{graded} \geq V_{threshold} $$

Question 11

Which of the following is a learned (acquired) reflex?

Accepted Answer

Riding a bicycle

Question 12

Which nerve is most likely affected if a patient cannot shrug their shoulders or turn their head?

Accepted Answer

Accessory nerve (XI)

Question 13

Which of the following is TRUE about the Babinski sign?

Accepted Answer

It indicates upper motor neuron injury when present in adults.

Question 14

Which of the following tracts carries pain and temperature sensations to the brain?

Accepted Answer

Spinothalamic tracts

Question 15

Which of the following is the correct order of the five basic components of a reflex arc?

Accepted Answer

Receptor, Sensory neuron, Integration center, Motor neuron, Effector

Question 16

Which cranial nerve provides parasympathetic motor control to the heart, lungs, and abdominal organs?

Accepted Answer

Vagus nerve (X)

Question 17

Which of the following is a function of the dorsal ramus of a spinal nerve?

Accepted Answer

Motor to true back muscles and sensory to posterior thorax

Question 18

Which of the following is TRUE about the structure of a nerve in the PNS?

Accepted Answer

The epineurium encloses all fascicles into a nerve, which also contains blood and lymph vessels.

Question 19

Which of the following best describes the function of mechanoreceptors?

Accepted Answer

They detect pressure, vibration, and stretch.

Peripheral Nervous System and Reflexes: Structure, Function, and Clinical Relevance

Study Guide - Practice Questions