Question 1

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

Accepted Answer

Control of involuntary physiological processes such as heart rate, digestion, and glandular secretion.

Question 2

Which of the following is a correct example of a visceral reflex controlled by the ANS?

Accepted Answer

Constriction of the pupil in response to bright light.

Question 3

The 'two-neuron hookup' of the ANS consists of which two types of neurons?

Accepted Answer

Preganglionic and postganglionic neurons.

Question 4

In the sympathetic division of the ANS, where are the cell bodies of preganglionic neurons located?

Accepted Answer

In the lateral horns of the thoracic and lumbar spinal cord.

Question 5

Which neurotransmitter is released by most postganglionic sympathetic fibers?

Accepted Answer

Norepinephrine

Question 6

Which of the following best describes the difference in the length of preganglionic and postganglionic fibers in the sympathetic and parasympathetic divisions?

Accepted Answer

Sympathetic division has short preganglionic and long postganglionic fibers; parasympathetic division has long preganglionic and short postganglionic fibers.

Question 7

Which of the following is a correct description of the neurotransmitter removal process at the synapse for the ANS?

Accepted Answer

Norepinephrine is removed by reuptake into the presynaptic neuron and enzymatic degradation.

Question 8

Which of the following best describes the structural organization of the sympathetic division?

Accepted Answer

Preganglionic neurons originate in the thoracolumbar regions and synapse in paravertebral or prevertebral ganglia.

Question 9

Which of the following is a correct statement about the parasympathetic division of the ANS?

Accepted Answer

It promotes 'rest and digest' activities such as increased digestive secretions and decreased heart rate.

Question 10

A patient presents with excessive sweating and rapid heart rate after a stressful event. Which division of the ANS is primarily responsible for these symptoms?

Accepted Answer

Sympathetic division

Question 11

Which of the following best describes the role of acetylcholine in the ANS?

Accepted Answer

It is released by all preganglionic neurons in both sympathetic and parasympathetic divisions.

Question 12

Which of the following is a correct description of the white and gray rami communicantes in the sympathetic division?

Accepted Answer

White rami carry preganglionic fibers from the spinal nerve to the sympathetic trunk; gray rami carry postganglionic fibers from the trunk to the spinal nerve.

Question 13

Which of the following best explains the effect of sympathetic stimulation on the heart?

Accepted Answer

Increases heart rate and contractility.

Question 14

Which of the following is a correct statement about the distribution of parasympathetic fibers?

Accepted Answer

They are primarily distributed to organs in the head, thorax, and abdomen.

Question 15

A patient is given a drug that blocks muscarinic acetylcholine receptors. Which of the following effects would most likely be observed?

Accepted Answer

Dry mouth and increased heart rate.

Question 16

Which of the following equations correctly represents the removal of acetylcholine from the synaptic cleft?

Accepted Answer

$$\mathrm{Acetylcholine} \xrightarrow{\mathrm{acetylcholinesterase}} \mathrm{Acetate} + \mathrm{Choline}$$

Question 17

Which of the following best describes the effect of parasympathetic stimulation on the digestive tract?

Accepted Answer

Increases peristalsis and stimulates digestive secretions.

Question 18

Which of the following is a correct description of the neurotransmitter released at the neuroeffector junction in the parasympathetic division?

Accepted Answer

Acetylcholine

Question 19

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

Accepted Answer

Spinal cord → ventral root → white ramus communicantes → sympathetic trunk ganglion → postganglionic neuron → target organ

Question 20

Which of the following best explains the difference between adrenergic and cholinergic fibers in the ANS?

Accepted Answer

Adrenergic fibers release norepinephrine; cholinergic fibers release acetylcholine.

Autonomic Nervous System (ANS): Structure, Function, and Neurotransmission

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