Question 1

Which of the following best describes the main difference between the somatic nervous system and the autonomic nervous system (ANS)?

Accepted Answer

The somatic nervous system controls voluntary skeletal muscle, while the ANS regulates involuntary smooth muscle, cardiac muscle, and glands.

Question 2

A patient is experiencing increased heart rate, dilated pupils, and decreased digestive activity. Which division of the ANS is primarily responsible for these effects?

Accepted Answer

Sympathetic division

Question 3

Which of the following statements about preganglionic and postganglionic neurons is correct?

Accepted Answer

Preganglionic neurons have cell bodies in the CNS and synapse with postganglionic neurons in autonomic ganglia.

Question 4

Which neurotransmitter is released by most sympathetic postganglionic neurons, and what is its primary effect?

Accepted Answer

Norepinephrine; stimulates adrenergic receptors to increase heart rate and blood pressure

Question 5

A person with myopia (nearsightedness) has difficulty seeing distant objects clearly. Which type of lens is used to correct this condition, and why?

Accepted Answer

Concave lens; it diverges light rays so the image focuses on the retina

Question 6

Which of the following best explains the role of the adrenal medulla in the sympathetic response?

Accepted Answer

It releases norepinephrine and epinephrine into the bloodstream, amplifying and prolonging the sympathetic response.

Question 7

Which receptor type is found on all postganglionic neurons in both sympathetic and parasympathetic ganglia, and what is its primary neurotransmitter?

Accepted Answer

Nicotinic receptor; acetylcholine

Question 8

A patient presents with gradual loss of peripheral vision and increased intraocular pressure. Which eye disorder is most likely?

Accepted Answer

Glaucoma

Question 9

Which of the following best describes the process of dark adaptation in the retina?

Accepted Answer

Rods regenerate rhodopsin, increasing sensitivity to low light over several minutes.

Question 10

Which structure in the inner ear is primarily responsible for detecting rotational (dynamic) equilibrium?

Accepted Answer

Semicircular canals

Question 11

A person is unable to distinguish between sweet and salty tastes but can still detect bitter and sour. Which cranial nerve is most likely affected?

Accepted Answer

Cranial nerve VII (facial)

Question 12

Which of the following best describes dual innervation in the ANS?

Accepted Answer

Most organs receive input from both sympathetic and parasympathetic divisions, allowing for precise regulation.

Question 13

Which of the following is a correct sequence for the visual pathway from the retina to the visual cortex?

Accepted Answer

Retina → optic nerve → optic chiasm → optic tract → lateral geniculate nucleus → visual cortex

Question 14

Which of the following best explains why the odor threshold is low for many substances?

Accepted Answer

Olfactory receptors are highly sensitive and only a few molecules are needed to trigger an action potential.

Question 15

A patient with Meniere’s disease is most likely to experience which of the following symptoms?

Accepted Answer

Episodic vertigo, tinnitus, and hearing loss

Question 16

Which of the following statements about autonomic reflexes is correct?

Accepted Answer

They regulate processes such as blood pressure, heart rate, and digestion without conscious awareness.

Question 17

Which of the following best describes the function of muscarinic receptors?

Accepted Answer

They are found on effector organs of the parasympathetic division and bind acetylcholine.

Question 18

A person with astigmatism has blurred vision due to which of the following?

Accepted Answer

An irregular curvature of the cornea or lens causing light to focus unevenly on the retina

Question 19

Which of the following best explains why sympathetic responses are generally more widespread and longer-lasting than parasympathetic responses?

Accepted Answer

The adrenal medulla releases hormones into the bloodstream, affecting multiple organs simultaneously.

Question 20

Which of the following is true regarding the auditory pathway?

Accepted Answer

Sound waves are converted to electrical signals in the cochlea, which are then transmitted via the vestibulocochlear nerve to the auditory cortex.

Autonomic Nervous System and Special Senses: Study Guide

Study Guide - Practice Questions

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