Exam 3 (Chapter 22) - Autonomic Nervous System Flashcards
Where are the cell bodies of the sympathetic preganglionic neurons located that play a role in the pupillary dilation?
Intermediolateral nucleus
Where do the preganglionic neurons synapse with postganglionic neurons?
Autonomic ganglia
What do sympathetic preganglionic axons enter the sympathetic trunk ganglion through?
Communicating branch
A tissue innervated solely by the sympathetic division is the ________.
Blood vessels of skeletal muscle
True or False: Cell Bodies of parasympathetic postganglionic neurons are located in the sympathetic trunk ganglia.
False
Which statement is true regarding the autonomic innervation of the adrenal medulla?
Sympathetic preganglionic neurons innervate chromaffin cells in the medulla.
What is pupillary constriction mediated by?
Parasympathetic nucleus of the oculomotor nerve.
Horner’s syndrome results from a lesion involving ___________.
The cranial cervical ganglion
What peripheral nerve triggers the contraction of the detrussor muscle of the bladder?
Pelvic nerve
All preganglionic neurons of the sympathetic and parasympathetic divisions are ________.
Cholinergic
When ACh binds to nicotinic receptors, what is their response?
Always excitatory
When norepinephrine binds to beta-adrenergic receptors, what is their response?
Either excitatory or inhibitory
Sympathetic postganglionic neurons innervating the heart release the neurotransmitter _________ that binds to ___________ receptors.
Norepinephrine; adrenergic (beta-1)
True or False: Sympathetic fibers in the heart release norepinephrine that binds to beta-adrenergic receptors, while parasympathetic fibers release ACh that binds to muscarinic receptors.
True
Activation of nAChRs result in generation of _________.
EPSP
What is NOT a feature of Horner’s syndrome?
Strabismus
Which muscle is innervated solely by the sympathetic division of the ANS?
Vascular smooth muscle
Under the fight or flight situation, increase in contractility of cardiac muscle cells is mediated by adrenergic ________ receptors, while relaxation of bronchiolar smooth muscle is mediated by adrenergic ________ receptors.
beta-1; beta-2
Which statement is correct?
A) Curare is an antagonist of cholinergic receptors
B) Atropine is an antagonist of adrenergic receptors
C) Strychnine is an antagonist of adrenergic receptors
Curare is an antagonist of cholinergic receptors
Which statement about autonomic reflexes is false?
There are no autonomic reflexes related to the smooth muscle of the gut.
