Skip to main content
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 12
Capitolo 16, Problema 12

All preganglionic autonomic fibers release______at their axon terminals, and the effects are always_____ .
(a) norepinephrine, inhibitory
(b) norepinephrine, excitatory
(c) acetylcholine, excitatory
(d) acetylcholine, inhibitory

Guida verificata passo dopo passo
1
Understand that the autonomic nervous system consists of preganglionic and postganglionic fibers, which release specific neurotransmitters to communicate with their target cells.
Recall that all preganglionic autonomic fibers, regardless of whether they belong to the sympathetic or parasympathetic division, release the same neurotransmitter at their axon terminals.
Identify the neurotransmitter released by preganglionic fibers, which is acetylcholine (ACh). This is a key fact in autonomic physiology.
Recognize that the effect of acetylcholine released by preganglionic fibers on the postganglionic neurons is always excitatory, meaning it stimulates the next neuron to fire.
Conclude that the correct answer must state that preganglionic autonomic fibers release acetylcholine and that the effect is excitatory.

Risposta video verificata per un problema simile:

Questa soluzione video è stata consigliata dai nostri tutor come utile per risolvere questo problema.

Concetti chiave

Ecco i concetti essenziali che devi comprendere per rispondere correttamente alla domanda.

Preganglionic Autonomic Fibers

Preganglionic autonomic fibers are nerve fibers that originate in the central nervous system and extend to autonomic ganglia. They transmit signals to postganglionic neurons, initiating autonomic responses. Understanding their neurotransmitter release is key to grasping autonomic nervous system function.
Video consigliato:
1:50
Somatic vs. Autonomic Nervous System

Neurotransmitters in the Autonomic Nervous System

Neurotransmitters are chemical messengers released at nerve terminals to communicate with target cells. In the autonomic nervous system, acetylcholine and norepinephrine are primary neurotransmitters, with acetylcholine typically released by preganglionic fibers and norepinephrine by most postganglionic fibers.
Video consigliato:
1:50
Somatic vs. Autonomic Nervous System

Excitatory vs. Inhibitory Effects

Neurotransmitters can have excitatory effects, promoting action potentials in the target cell, or inhibitory effects, reducing the likelihood of activation. The effect depends on the receptor type and location, influencing how autonomic signals regulate organ function.
Video consigliato:
Percorso guidato
1:32
Effects of the Complement System
Pratica correlata
Domanda del libro di testo

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

1049
views
Domanda del libro di testo

What physiological activities distinguish non-REM sleep from REM sleep?

689
views
Domanda del libro di testo

What anatomical and functional changes in the brain are linked to alterations that occur with aging?

941
views
Domanda del libro di testo

Which three collateral ganglia serve as origins for ganglionic neurons that innervate organs or tissues in the abdominopelvic region?

876
views
Domanda del libro di testo

What cellular mechanisms identified in animal studies are thought to be involved in memory formation and storage?

759
views
Domanda del libro di testo

How does the emergence of sympathetic fibers from the spinal cord differ from the emergence of parasympathetic fibers?

742
views