Q: Which equation best represents the breakdown of acetylcholine in the synaptic cleft?

$$\text{Acetylcholine} \xrightarrow{\text{AChE}} \text{Acetate} + \text{Choline}$$

Q: Which equation best represents the breakdown of norepinephrine in tissues?

$$\text{Norepinephrine} \xrightarrow{\text{COMT}} \text{Inactive metabolites}$$

Question 1

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

Accepted Answer

Routine homeostatic adjustments and control of visceral effectors such as smooth muscle, cardiac muscle, and glands

Question 2

A patient experiences increased heart rate, dilated pupils, and reduced digestive activity after a stressful event. Which division of the ANS is primarily responsible for these effects?

Accepted Answer

Sympathetic division

Question 3

Which neurotransmitter is released by preganglionic neurons in both the sympathetic and parasympathetic divisions of the ANS?

Accepted Answer

Acetylcholine

Question 4

In the sympathetic division, which type of ganglia is located alongside the spinal cord and controls effectors in the body wall, thoracic cavity, head, neck, and limbs?

Accepted Answer

Chain ganglia

Question 5

Which cranial nerve is responsible for approximately 75% of all parasympathetic output?

Accepted Answer

Cranial nerve X (vagus)

Question 6

A drug that blocks muscarinic acetylcholine receptors would most likely affect which division of the ANS?

Accepted Answer

Parasympathetic division

Question 7

Which of the following statements about the sympathetic division is TRUE?

Accepted Answer

Preganglionic fibers are short and originate from thoracic and lumbar segments (T1-L2)

Question 8

Which receptor type is most commonly stimulated by norepinephrine released from sympathetic postganglionic neurons?

Accepted Answer

Alpha-1 adrenergic receptors

Question 9

During a 'fight or flight' response, which physiological change is LEAST likely to occur?

Accepted Answer

Constriction of pupils

Question 10

Which equation best represents the breakdown of acetylcholine in the synaptic cleft?

Accepted Answer

$$	ext{Acetylcholine} \xrightarrow{	ext{AChE}} 	ext{Acetate} + 	ext{Choline}$$

Question 11

A patient is given a beta-2 adrenergic agonist to treat asthma. What is the expected effect on the respiratory tract?

Accepted Answer

Relaxation of smooth muscle in respiratory passageways

Question 12

Which of the following is a key difference between the sympathetic and parasympathetic divisions regarding the location of their ganglia?

Accepted Answer

Sympathetic ganglia are located near the spinal cord, while parasympathetic ganglia are located near or within target organs

Question 13

Which neurotransmitter is released by postganglionic neurons in the parasympathetic division?

Accepted Answer

Acetylcholine

Question 14

Which of the following best explains why the effects of norepinephrine last longer than those of acetylcholine?

Accepted Answer

Acetylcholine is rapidly broken down in the synapse by acetylcholinesterase, while norepinephrine is reabsorbed and broken down more slowly by monoamine oxidase (MAO) and catechol-O-methyltransferase (COMT)

Question 15

Which of the following is a function of the parasympathetic division?

Accepted Answer

Increased secretion by salivary and digestive glands

Question 16

A patient with damage to the sacral segments (S2-S4) of the spinal cord would most likely experience difficulty with which parasympathetic function?

Accepted Answer

Stimulation of urination and defecation

Question 17

Which of the following best describes the pathway of a sympathetic neuron from the spinal cord to its target organ?

Accepted Answer

Short preganglionic axon, ganglion near spinal cord, long postganglionic axon

Question 18

Which equation best represents the breakdown of norepinephrine in tissues?

Accepted Answer

$$	ext{Norepinephrine} \xrightarrow{	ext{COMT}} 	ext{Inactive metabolites}$$

Question 19

Which of the following scenarios best illustrates the concept of homeostasis maintained by the ANS?

Accepted Answer

A person’s digestive activity increases after eating, while heart rate and blood pressure decrease due to parasympathetic dominance

Question 20

Which of the following is TRUE regarding the target area and function of the sympathetic division?

Accepted Answer

The sympathetic division targets broad areas and prepares the body for emergency situations

The Autonomic Nervous System: Structure, Function, and Neurotransmission

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