PharmacologyLesson 2 of 2 in the course The Autonomic Nervous System

Autonomic Pharmacology: Nicotine, Adrenergic Drugs, and Motion Sickness

5 flashcards · 5 quiz questions · 5 match pairs · 5 fill-in sentences · English

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Summary

Drugs that affect the autonomic nervous system (ANS) change how its signals act on target organs. Their effects depend not only on the chemical involved, but also on the receptors that receive the signal. This lesson introduces these principles and explains why nicotine can influence both autonomic divisions.

Autonomic neurons communicate using signaling molecules that bind to proteins called receptors on target cells. A signaling molecule cannot be understood in isolation: its effect depends on which receptor it binds to and where that receptor is located.

All flashcards

Sympathomimetic drug
A drug that increases or imitates sympathetic effects.
Nicotine at autonomic ganglia
An agonist at nicotinic ACh receptors in both sympathetic and parasympathetic ganglia.
Phenylephrine
An alpha-1 agonist that causes vasoconstriction and can reduce nasal congestion.
Clonidine
An alpha-2 agonist that can reduce sympathetic outflow through central mechanisms.
Pilocarpine
A muscarinic agonist that constricts the pupil and can promote aqueous humor drainage.

Quiz questions

  1. How can phenylephrine reduce nasal congestion?Answer: It activates alpha-1 receptors and causes vasoconstriction in nasal mucosa.
  2. Which action is characteristic of metoprolol?Answer: Preferential blockade of beta-1 receptors, reducing some sympathetic effects on the heart.
  3. How can clonidine reduce sympathetic effects despite being an agonist?Answer: It activates alpha-2 receptors and can reduce central sympathetic outflow.
  4. What eye effect can pilocarpine produce?Answer: Ciliary muscle contraction that can support aqueous humor drainage.
  5. Which statement correctly describes dimenhydrinate?Answer: It is an antihistamine used to help prevent motion sickness and can cause drowsiness.

Based on Anatomy and Physiology 2e by J. Gordon Betts, Kelly A. Young, James A. Wise, Eddie Johnson, Brandon Poe, Dean H. Kruse, Oksana Korol, Jody E. Johnson, Mark Womble, Peter DeSaix (OpenStax), licensed CC BY 4.0. Adapted into a summary, flashcards and quizzes.

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