Physiology of the Autonomic Nervous System Flashcards
What does norepinephrine excite?
alpha and beta1 adrenergic receptors
What does epinephrine excite?
Alpha beta 1 and 2 adrenergic receptors
What metabolic changes does the SNS activate?
Glycogenolysis
Gluconeogenesis
Lipolysis
What is pupil dilation and contraction called respectively?
Mydriasis
Miosis
What muscle is responsible for pupil contraction and dilation?
Ciliary muscles
What effect does the SNS have on the renal system?
Increased Renin release and renal artery constriction
What is true about the PSNS effect on vasodilation?
It has very weak affects on dilation and constriction
What are the three muscles involved in urination?
Detrusor muscle
Trigone muscle
Sphincter
What happens to the three urinary muscles in PSNS stimulation?
Detrusor contraction
Trigone relax
Sphincter relax
What happens to the urinary muscles in SNS stimulation?
Detrusor relax
Trigone constrict
Sphincter constrict
Which receptor is found throughout the entire heart?
Beta receptors for sympathetic control
Male ejaculation is controlled by which ANS system?
SNS
Male erection is controlled by which ANS system?
PSNS (NO on M receptor)
When does the PSNS cause vasodilation?
If endothelium is present
When does the PSNS cause vasoconstriction?
If bare smooth muscle only present
What is uterine tone most significantly under control by?
Hormonal control
How is Ach made?
Acetyl-CoA + Choline
choline acetylase enzyme
What is Ach broken down and reuptaken as?
Choline + acetate
Ach-esterase enzyme
What are the catecholamines?
Dopamine, epi/norepinephrine
Where is norepinephrine transformed into epinephrine?
Adrenal medulla
What is the sequence of molecules to create catecholamines?
Phenylalanine-> Tyrosine-> DOPA-> Dopamine-> Norepinephrine-> Epinephrine
Know catecholamine metabolism diagram
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