GI Part 7- 2 Flashcards
What are NO, VIP, and Substance P, and ATP examples of?
NANC substances
What NANC substance is:
Inhibitory substance that reduces the motility of the GI tract?
NO
What NANC substance is:
Inhibitory substance, causes relaxation of smooth muscle sphincters and possibly Stimulatory to secretory glands?
VIP
What NANC substance is:
Excitatory substance, increases secretion and motility of the GI tract?
Substance P
What NANC substance is:
Extracellular signal molecule acting on purinergic receptors, activates inhibitory motor neurons inducing relaxation of the smooth muscle in the gut?
ATP
What NANC substance is:
Inhibitory- 2
ATP- activates inhibitory- 1
NO and Substance P
ATP
SNS —> norepinephrine =
Almost always _______ GI activity
Inhibits
PNSN —> ACh =
Most often ______ GI activity
Excites
_______ afferents = some of these nerves fibers have their cell bodies have their bodies in the enteric nervous system, and some have them in dorsal root ganglia of the spiral cord?
Visceral
What outer innervations are stimulated by:
Irritation of gut mucosa
Excessive gut distention
Presence of specific chemical substances in the gut
Visceral afferents
The following origin in the medulla oblongata through the ______ nerve:
Oesophagus, stomach, small intestine, colon ascendens, pancreas, gallbladder, and liver
Vagus
The following origin in the sacral spinal cord through the ______ nerve:
Colon descendens and distal parts of the GI tract?
Pelvic
What type of ganglionic neurotransmitters are ACh and NANC substances VIP and NO?
Post
Preganglionic neurons have _____ axons
Postganglionic neurons have _____ axons to target organs
Short
Long
On either side of the spinal cord, many sympathetic ganglia are arranged like a string, forming a ________ ganglion _____
Sympathetic
Chain
