Question 1

Which cranial nerve is primarily responsible for transmitting visual information from the retina to the brain, and what would be the likely consequence of damage to this nerve?

Accepted Answer

Optic nerve (II); loss of vision in the affected eye

Question 2

A patient presents with difficulty swallowing and hoarseness. Which cranial nerve is most likely affected, and what is its primary function?

Accepted Answer

Vagus nerve (X); controls heart rate and digestive organs

Question 3

Which of the following best describes a dermatome?

Accepted Answer

A region of skin innervated by a single spinal nerve

Question 4

Why is referred pain clinically significant, especially in cases of myocardial infarction?

Accepted Answer

Because pain from internal organs can be perceived in unrelated areas of the skin due to shared spinal nerve pathways

Question 5

Which sequence correctly represents the steps of the flexion-crossed extension reflex?

Accepted Answer

Painful stimulus → Activation of flexor muscles on the affected side → Inhibition of extensor muscles on the affected side → Activation of extensor muscles on the opposite side → Inhibition of flexor muscles on the opposite side

Question 6

Which of the following is a key difference between the Somatic Motor and Autonomic Nervous Systems?

Accepted Answer

Somatic motor system controls voluntary skeletal muscles, while autonomic nervous system controls involuntary smooth and cardiac muscles

Question 7

Which neurotransmitter is released at the target organ by the parasympathetic nervous system, and what is its main effect?

Accepted Answer

Acetylcholine; promotes 'rest and digest' responses such as decreased heart rate and increased digestion

Question 8

During a stressful situation, which physiological changes are most likely mediated by the sympathetic nervous system?

Accepted Answer

Increased heart rate, dilated pupils, decreased digestive activity

Question 9

Which equation best represents the relationship between the number of spinal nerves ($$N) $$and the number of dermatomes ($$D) in $$the human body?

Accepted Answer

$$D \approx N$$

Question 10

A patient has lost the ability to move their facial muscles on one side and cannot taste on the anterior two-thirds of their tongue. Which cranial nerve is most likely damaged?

Accepted Answer

Facial nerve (VII)

Question 11

Which of the following best explains why the autonomic nervous system can rapidly adjust blood pressure during exercise?

Accepted Answer

The sympathetic nervous system increases heart rate and constricts blood vessels, raising blood pressure

Question 12

Which cranial nerve is responsible for hearing and balance, and what would be the result of its damage?

Accepted Answer

Vestibulocochlear nerve (VIII); loss of hearing and balance

Question 13

Which of the following is NOT a typical effect of the parasympathetic nervous system?

Accepted Answer

Increased heart rate

Question 14

If a person steps on a sharp object with their right foot, which muscles are activated and inhibited during the flexion-crossed extension reflex?

Accepted Answer

Right leg flexors activated, right leg extensors inhibited; left leg extensors activated, left leg flexors inhibited

Question 15

Which cranial nerve controls the movement of the tongue, and what would be the effect of its damage?

Accepted Answer

Hypoglossal nerve (XII); difficulty with speech and swallowing

Question 16

Which of the following best describes the main effect of the sympathetic nervous system on the lungs?

Accepted Answer

Bronchodilation, allowing increased airflow

Question 17

Which equation represents the change in heart rate ($$\Delta HR) $$due to sympathetic stimulation, assuming baseline heart rate ($$HR_0) $$and increase ($$\Delta S$$)?

Accepted Answer

$$\Delta HR = HR_0$ + \Delta S$$

Question 18

Which of the following is a correct comparison between the sympathetic and parasympathetic nervous systems?

Accepted Answer

Sympathetic system prepares the body for 'fight or flight', while parasympathetic system promotes 'rest and digest'

Peripheral and Autonomic Nervous System: Study Guide

Study Guide - Practice Questions

Study Guide - Flashcards