Question 1

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

Accepted Answer

It regulates subconscious adjustments to support optimal internal activities.

Question 2

Which neurotransmitter is released by somatic motor neurons at the neuromuscular junction, and what is its effect?

Accepted Answer

Acetylcholine (ACh); always stimulatory

Question 3

During a stressful event, which division of the ANS is primarily activated, and what are two physiological changes that occur?

Accepted Answer

Sympathetic; increased heart rate and dilated bronchioles

Question 4

Which anatomical feature distinguishes the sympathetic division from the parasympathetic division of the ANS?

Accepted Answer

Parasympathetic ganglia are located close to or within the target organs.

Question 5

A patient is given a drug that blocks adrenergic receptors. What is the most likely effect on their blood pressure?

Accepted Answer

Blood pressure will decrease due to reduced sympathetic vasoconstriction.

Question 6

Which of the following scenarios best illustrates the concept of 'dual innervation' in the ANS?

Accepted Answer

The heart receives input from both sympathetic and parasympathetic fibers, allowing for increased or decreased heart rate.

Question 7

Which equation correctly represents the relationship between blood pressure ($BP$), cardiac output ($CO$), and peripheral resistance ($PR$) as regulated by the ANS?

Accepted Answer

$BP = CO 	imes PR$

Question 8

Which of the following is a direct effect of increased sympathetic stimulation during exercise?

Accepted Answer

Dilation of blood vessels to skeletal muscles

Question 9

A patient presents with hypertension due to overactive sympathetic vasoconstrictor responses. Which class of drugs would be most effective in treating this condition?

Accepted Answer

Adrenergic receptor blockers

Question 10

Which structure serves as the main integrative center for autonomic nervous system function?

Accepted Answer

Hypothalamus

Question 11

Which of the following best explains why the effects of the sympathetic division are longer-lasting and more diffuse than those of the parasympathetic division?

Accepted Answer

Norepinephrine and epinephrine are inactivated more slowly than acetylcholine.

Question 12

Which of the following is a consequence of blocking parasympathetic responses in the digestive and urinary tracts?

Accepted Answer

Fecal and urinary retention

Question 13

Which division of the ANS is responsible for the 'rest-and-digest' response, and what are two hallmark physiological changes associated with its activation?

Accepted Answer

Parasympathetic; decreased heart rate and increased digestive tract activity

Question 14

Which of the following best describes the effect of sympathetic vasomotor tone on blood vessels during an emergency?

Accepted Answer

Blood vessels to the skin constrict, minimizing bleeding if injury occurs.

Question 15

Which of the following is NOT a function of the hypothalamus in autonomic nervous system regulation?

Accepted Answer

Direct voluntary control of skeletal muscle contraction

Question 16

Which of the following best explains the difference in neurotransmitter release between the somatic and autonomic nervous systems?

Accepted Answer

Somatic motor neurons release acetylcholine, while autonomic postganglionic neurons may release acetylcholine or norepinephrine.

Question 17

Which of the following best describes the effect of the sympathetic division on metabolic rate and blood glucose levels?

Accepted Answer

Increases metabolic rate and mobilizes glucose for fuel

Question 18

Which of the following is a real-life example of cooperative effects between the sympathetic and parasympathetic divisions?

Accepted Answer

Parasympathetic fibers cause erection, while sympathetic fibers cause ejaculation or reflex contraction of the vagina.

Question 19

Which of the following best describes the role of the medulla oblongata in ANS function?

Accepted Answer

It contains centers that regulate heart rate, blood vessel diameter, and gastrointestinal activity.

Homeostasis and the Autonomic Nervous System: Structure and Function

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