Question 1

Which neurotransmitter is released by sympathetic preganglionic neurons at the autonomic ganglion, and what is its effect?

Accepted Answer

Acetylcholine; excitatory

Question 2

A patient receives a local anesthetic mixed with epinephrine during a dental procedure. What is the primary physiological effect of epinephrine in this context?

Accepted Answer

Epinephrine causes vasoconstriction, confining the anesthetic to the site.

Question 3

Which receptor type is primarily responsible for vasoconstriction in intestinal blood vessels when epinephrine binds?

Accepted Answer

$$\alpha-$$adrenergic receptor

Question 4

During exercise, sympathetic stimulation causes vasodilation in skeletal muscle blood vessels. Which neurotransmitter and receptor are involved?

Accepted Answer

Acetylcholine and cholinergic receptor

Question 5

Which of the following best describes the mechanism of action for adrenergic agonists?

Accepted Answer

They activate adrenergic receptors, producing a physiological effect.

Question 6

A patient with asthma uses an inhaler containing albuterol. Which receptor does albuterol target and what is the effect?

Accepted Answer

$$\$$beta_2$$-adrenergic receptor; bronchodilation

Question 7

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

Accepted Answer

Norepinephrine

Question 8

Sweat glands are innervated by sympathetic nerves that release acetylcholine. What is the physiological significance of this cholinergic effect?

Accepted Answer

It is crucial for thermoregulation and induces sweating.

Question 9

Which of the following statements about adrenergic receptors is correct?

Accepted Answer

The same neurotransmitter can produce different effects depending on the receptor type.

Question 10

A drug that blocks $$\$$alpha_1$$-adrenergic receptors is most likely to cause which effect?

Accepted Answer

Vasodilation and decreased blood pressure

Question 11

Which of the following best explains why the same neurotransmitter can have different effects in different tissues?

Accepted Answer

Different tissues have different types of membrane receptors.

Question 12

Which equation best represents the relationship between neurotransmitter concentration ($$[NT]$$), receptor binding ($$R$$), and physiological effect ($$E$$)?

Accepted Answer

$$E = [NT] 	imes R$$

Question 13

Which of the following scenarios illustrates the concept of receptor specificity in the autonomic nervous system?

Accepted Answer

Epinephrine binds to $$\alpha-$$adrenergic receptors in intestinal blood vessels causing vasoconstriction, but binds to $$\$$beta_2$$-adrenergic receptors in skeletal muscle blood vessels causing vasodilation.

Question 14

Which of the following is a correct sequence for neurotransmitter release in the sympathetic nervous system?

Accepted Answer

Preganglionic neuron releases acetylcholine; postganglionic neuron releases norepinephrine

Question 15

Which of the following best describes the function of varicosities in sympathetic postganglionic neurons?

Accepted Answer

They store and release neurotransmitters at multiple sites along the axon.

Question 16

A patient is prescribed prazosin, an $$\$$alpha_1$$-adrenergic antagonist. What is the expected effect on blood pressure?

Accepted Answer

Decrease in blood pressure due to vasodilation

Question 17

Which of the following is a real-world example of a $$\$$beta_2$$-adrenergic agonist used in clinical practice?

Accepted Answer

Albuterol inhaler for asthma

Question 18

Which equation describes the effect of an adrenergic antagonist ($$A) on $$receptor activation ($$R) $$and physiological effect ($$E$$)?

Accepted Answer

$$E = R - A$$

Question 19

Which of the following best explains why epinephrine is added to local anesthetic solutions in surgical procedures?

Accepted Answer

Epinephrine causes vasoconstriction, reducing bleeding and prolonging anesthetic action.

Chapter 16- Lecture 2

Study Guide - Practice Questions

Study Guide - Flashcards