Mastering the Autonomic Nervous System
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Questions and Answers

Which of the following receptors are activated by muscarine, a toadstool poison?

  • Beta receptors
  • Nicotinic receptors
  • Muscarinic receptors (correct)
  • Alpha receptors

Which of the following receptors are ligand-gated ion channels?

  • Nicotinic receptors (correct)
  • Alpha receptors
  • Beta receptors
  • Muscarinic receptors

Which of the following receptors are activated by nicotine?

  • Muscarinic receptors
  • Beta receptors
  • Nicotinic receptors (correct)
  • Alpha receptors

Which of the following receptors use a G protein signaling mechanism?

<p>Muscarinic receptors (C)</p> Signup and view all the answers

Which 2 receptors are activated by acetylcholine?

<p>Muscarinic receptors and Nicotinic receptors (D)</p> Signup and view all the answers

Which of the following receptors are linked to a different G protein?

<p>Beta receptors (D)</p> Signup and view all the answers

Which of the following receptors are primarily activated by norepinephrine (NE)?

<p>Alpha receptors (B)</p> Signup and view all the answers

Which of the following receptors are equally activated by epinephrine (Epi) and norepinephrine (NE)?

<p>Beta receptors (B)</p> Signup and view all the answers

Which of the following receptors have a greater effect on stimulating the heart?

<p>Beta receptors (D)</p> Signup and view all the answers

Which of the following receptors have a greater effect on constricting blood vessels?

<p>Alpha receptors (A)</p> Signup and view all the answers

Which neurotransmitter is primarily secreted by cholinergic fibers in the autonomic nervous system?

<p>Acetylcholine (ACh) (B)</p> Signup and view all the answers

What percentage of all parasympathetic nerve fibers are found in the vagus nerves?

<p>75% (A)</p> Signup and view all the answers

Which branch of the autonomic nervous system primarily innervates the airways of the lungs?

<p>Parasympathetic nervous system (A)</p> Signup and view all the answers

Which type of nerve fibers secrete norepinephrine (NE) in the autonomic nervous system?

<p>Adrenergic fibers (B)</p> Signup and view all the answers

Which cranial nerves of the parasympathetic nervous system have interruptions in their preganglionic fibers?

<p>III, VII, and IX (A)</p> Signup and view all the answers

Which neurotransmitter is primarily secreted by most postganglionic fibers in the parasympathetic nervous system?

<p>Acetylcholine (ACh) (A)</p> Signup and view all the answers

Which neurotransmitter is primarily secreted by most postganglionic fibers in the sympathetic nervous system?

<p>Norepinephrine (NE) (B)</p> Signup and view all the answers

Which type of nerve fibers are present in both the sympathetic and parasympathetic nervous systems?

<p>Cholinergic fibers (B)</p> Signup and view all the answers

Which branch of the autonomic nervous system primarily secretes acetylcholine (ACh)?

<p>Parasympathetic nervous system (C)</p> Signup and view all the answers

Which branch of the autonomic nervous system primarily secretes norepinephrine (NE)?

<p>Sympathetic nervous system (D)</p> Signup and view all the answers

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