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Ch. 16 The Autonomic Nervous System and Higher-Order Functions
Martini - Fundamentals of Anatomy & Physiology 11th Edition
Martini, Nath, Bartholomew11th EditionFundamentals of Anatomy & PhysiologyISBN: 9780136874089Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoMartini, Nath, Bartholomew 11th EditionCh. 16 The Autonomic Nervous System and Higher-Order FunctionsProblema 13
Capitolo 16, Problema 13

The neurotransmitter at all synapses and neuromuscular or neuroglandular junctions in the parasympathetic division of the ANS is
(a) Epinephrine
(b) Norepinephrine
(c) Cyclic-AMP
(d) Acetylcholine

Guida verificata passo dopo passo
1
Step 1: Understand the parasympathetic division of the autonomic nervous system (ANS). It primarily uses a specific neurotransmitter to communicate at synapses and junctions with muscles and glands.
Step 2: Recall that neurotransmitters are chemical messengers that transmit signals across a synapse from one neuron to another target cell, such as a muscle or gland cell.
Step 3: Identify the common neurotransmitters listed: Epinephrine and Norepinephrine are typically associated with the sympathetic division of the ANS, while Cyclic-AMP is a second messenger, not a neurotransmitter.
Step 4: Recognize that Acetylcholine is the neurotransmitter released at all parasympathetic synapses and neuromuscular or neuroglandular junctions, facilitating parasympathetic responses.
Step 5: Conclude that the correct neurotransmitter for the parasympathetic division is Acetylcholine, based on its role in transmitting parasympathetic signals.

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Parasympathetic Division of the Autonomic Nervous System (ANS)

The parasympathetic division is one branch of the ANS responsible for 'rest and digest' functions. It conserves energy by slowing the heart rate and promoting digestion. Understanding its role helps identify the neurotransmitters involved in its signaling pathways.
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Divisions of the ANS

Neurotransmitters in the Autonomic Nervous System

Neurotransmitters are chemical messengers that transmit signals across synapses. In the ANS, different divisions use specific neurotransmitters to communicate with target organs. Recognizing which neurotransmitter is used by the parasympathetic division is key to answering the question.
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Somatic vs. Autonomic Nervous System

Acetylcholine as the Primary Parasympathetic Neurotransmitter

Acetylcholine is the neurotransmitter released at all parasympathetic synapses and neuromuscular or neuroglandular junctions. It binds to cholinergic receptors to mediate parasympathetic effects, distinguishing it from sympathetic neurotransmitters like norepinephrine.
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Neurotransmitters of the ANS
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