Question 1

Alpha and beta receptors are the two primary subcategories of

Accepted Answer

Alpha and beta receptors are subtypes of adrenergic receptors, which are activated by adrenaline and noradrenaline. This classification is based on the specific binding affinity of the receptors for different agonists and their respective downstream signaling pathways.

Question 2

A drug that affects nicotinic cholinergic receptors will affect activity in both divisions of the autonomic nervous system (ANS)because

Accepted Answer

Nicotinic cholinergic receptors are located at the junction between preganglionic and postganglionic neurons in both the sympathetic and parasympathetic pathways. Therefore, a drug that affects these receptors will affect activity in both divisions of the autonomic nervous system. Option A is not accurate because not all organs and tissues innervated by the ANS have nicotinic cholinergic receptors. Option C is not accurate because while both divisions of the ANS can mediate the release of epinephrine, it is not the sole mechanism by which they affect peripheral tissues. Option D is incorrect because only option B is accurate.

Question 3

All preganglionic neurons and parasympathetic postganglionic neurons are said to be _____ in nature because of the presence of ______ at their respective synapses.

Accepted Answer

Preganglionic neurons and parasympathetic postganglionic neurons are cholinergic in nature because they release acetylcholine at their respective synapses. Adrenergic neurons release norepinephrine or epinephrine as their neurotransmitter. Therefore, options A, B, C, and E are incorrect.

Question 4

In most peripheral tissues,sympathetic postganglionic neurons release ____ that binds directly to ____ receptors.

Accepted Answer

Sympathetic postganglionic neurons release norepinephrine that binds directly to adrenergic receptors in most peripheral tissues.

Question 5

A drug that inhibits muscarinic cholinergic receptors will selectively

Accepted Answer

Muscarinic cholinergic receptors are primarily found on tissues innervated by the parasympathetic nervous system, so inhibiting these receptors will lead to a decrease in parasympathetic responses on peripheral tissues.

Quiz 18: Introduction to Autonomic Pharmacology

Alpha and beta receptors are the two primary subcategories of

A drug that affects nicotinic cholinergic receptors will affect activity in both divisions of the autonomic nervous system (ANS) because

All preganglionic neurons and parasympathetic postganglionic neurons are said to be _ in nature because of the presence of __ at their respective synapses.

In most peripheral tissues,sympathetic postganglionic neurons release that binds directly to receptors.

A drug that inhibits muscarinic cholinergic receptors will selectively