Question 1

Which of the following best describes the difference between nicotinic and muscarinic acetylcholine receptors?

Accepted Answer

Nicotinic receptors are ionotropic and always excitatory, while muscarinic receptors are metabotropic and can be excitatory or inhibitory.

Question 2

A patient is given a drug that acts as a beta-2 adrenergic agonist. Which of the following effects would you expect to observe?

Accepted Answer

Bronchodilation and relaxation of smooth muscle in the digestive tract

Question 3

Which neurotransmitter is released by postganglionic sympathetic neurons at most effector organs?

Accepted Answer

Norepinephrine (NE)

Question 4

Which of the following is a correct pairing of receptor type and its primary effect?

Accepted Answer

Alpha-1 adrenergic receptor: excitatory

Question 5

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

Accepted Answer

Decreased activity of the parasympathetic nervous system, such as dry mouth and increased heart rate

Question 6

Which region of the central nervous system is considered the 'executive controller' of the autonomic nervous system?

Accepted Answer

Hypothalamus

Question 7

Which of the following best explains why blood vessels are under tonic sympathetic control?

Accepted Answer

Blood vessels receive continuous sympathetic input, which maintains a baseline level of vasoconstriction.

Question 8

Which of the following scenarios best illustrates the effect of an alpha-2 adrenergic receptor agonist?

Accepted Answer

Decreased release of norepinephrine, leading to reduced sympathetic activity

Question 9

A patient with asthma is prescribed a medication that targets beta-2 adrenergic receptors. What is the primary therapeutic effect of this medication?

Accepted Answer

Relaxation of bronchiolar smooth muscle, leading to bronchodilation

Question 10

Which of the following statements about autonomic tone is correct?

Accepted Answer

Autonomic tone refers to the constant activity of both sympathetic and parasympathetic divisions.

Question 11

Which of the following best describes the effect of a beta-1 adrenergic receptor antagonist on the heart?

Accepted Answer

It decreases heart rate and force of contraction.

Question 12

Which of the following is true regarding the neurotransmitter released at the effector organ in the parasympathetic nervous system?

Accepted Answer

It is acetylcholine, which binds to muscarinic receptors.

Question 13

A patient is given a drug that acts as an antagonist at alpha-1 adrenergic receptors. Which of the following effects would you expect?

Accepted Answer

Decreased vasoconstriction and lower blood pressure

Question 14

Which of the following best describes the mechanism of action for nicotinic acetylcholine receptors?

Accepted Answer

They are ligand-gated ion channels that allow Na+ influx and K+ efflux, causing depolarization.

Question 15

Which of the following is a correct example of a real-life application of an autonomic drug?

Accepted Answer

A muscarinic antagonist is used to treat bradycardia by increasing heart rate.

Autonomic Nervous System (ANS): Receptors, Neurotransmitters, and Regulation

Study Guide - Practice Questions