Question 1

Which of the following best describes the primary function of the autonomic nervous system (ANS)?

Accepted Answer

It innervates smooth muscle, cardiac muscle, and glands to regulate involuntary body functions.

Question 2

A patient is experiencing increased heart rate, dilated pupils, and dry mouth after a car accident. Which division of the ANS is primarily responsible for these symptoms?

Accepted Answer

Sympathetic division

Question 3

Which neurotransmitter is released by all preganglionic fibers of the autonomic nervous system?

Accepted Answer

Acetylcholine

Question 4

Which of the following statements about the anatomical differences between the sympathetic and parasympathetic divisions is correct?

Accepted Answer

Parasympathetic fibers have long preganglionic and short postganglionic fibers, while sympathetic fibers have short preganglionic and long postganglionic fibers.

Question 5

A drug that blocks muscarinic receptors would most likely cause which of the following effects?

Accepted Answer

Dilation of pupils and decreased secretion from salivary glands

Question 6

Which of the following best explains why the sympathetic division tends to have more diffuse and longer-lasting effects than the parasympathetic division?

Accepted Answer

Sympathetic neurotransmitters, especially norepinephrine and epinephrine, are inactivated more slowly and can enter the bloodstream.

Question 7

Which of the following is TRUE regarding the effect of acetylcholine (ACh) at nicotinic and muscarinic receptors?

Accepted Answer

ACh is always stimulatory at nicotinic receptors, but can be either stimulatory or inhibitory at muscarinic receptors depending on the target organ.

Question 8

A patient is given a drug that stimulates beta-2 ($$\$$beta_2$$) adrenergic receptors. Which of the following effects would you expect?

Accepted Answer

Bronchodilation (relaxation of bronchial smooth muscle)

Question 9

Which of the following best describes the concept of 'dual innervation' in the autonomic nervous system?

Accepted Answer

Most visceral organs receive input from both sympathetic and parasympathetic divisions, which usually have opposing effects.

Question 10

Which of the following is a unique role of the sympathetic division of the ANS?

Accepted Answer

Thermoregulatory responses to heat, such as sweating

Question 11

A patient with a spinal cord injury loses sympathetic innervation to the kidneys. Which of the following effects is most likely to occur?

Accepted Answer

Decreased release of renin, leading to lower blood pressure

Question 12

Which of the following best explains why a single neurotransmitter, such as acetylcholine, can have different effects on different organs?

Accepted Answer

The effect depends on the type of receptor (nicotinic or muscarinic) present on the target organ.

Question 13

Which of the following is a correct pairing of neurotransmitter and receptor type in the autonomic nervous system?

Accepted Answer

Acetylcholine at nicotinic receptors

Question 14

A person is relaxing after a meal. Which of the following physiological changes is most likely occurring due to parasympathetic activity?

Accepted Answer

Constricted pupils and increased digestive activity

Question 15

Which of the following best describes the efferent pathway of the autonomic nervous system?

Accepted Answer

A two-neuron chain consisting of a preganglionic neuron and a postganglionic neuron.

Question 16

Which of the following organs receives only sympathetic innervation?

Accepted Answer

Sweat glands

Question 17

A patient is given a drug that inhibits acetylcholinesterase. What effect would this have on the parasympathetic nervous system?

Accepted Answer

It would increase the duration and intensity of acetylcholine action, enhancing parasympathetic effects.

Question 18

Which of the following best describes the role of the hypothalamus in autonomic nervous system function?

Accepted Answer

It is the main integrative center for autonomic nervous system activity.

Question 19

Which of the following is a correct statement about visceral reflex arcs compared to somatic reflex arcs?

Accepted Answer

Visceral reflex arcs use visceral sensory neurons and have two consecutive motor neurons.

Question 20

A patient is experiencing difficulty with thermoregulation, such as inability to sweat in response to heat. Which division of the ANS is most likely impaired?

Accepted Answer

Sympathetic division

The Autonomic Nervous System: Structure, Function, and Clinical Relevance

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