GI Part 8- 1 Flashcards
What GI reflex is:
Signals from the stomach that causes evacuation of the colon
Gastrocolic
What GI reflex is:
Signals from the colon and small intestine
Inhibit stomach motility and stomach secretion
Enterogastric reflex
What GI reflex is:
Signals from the colon that inhibit emptying of ileal contents into the colon
Colonileal
The gastrocolic, enterogastric, and colonieleal reflex are from the gut to the __________ sympathetic ganglia, then back tot he GI tract?
Prevertebral
Reflexes that are entirely within the ____ _____:
Control of GI secretion, peristalsis, formation of mixing contractions, local inhibitory effects, etc
Gut wall
Reflexes from the gut to the _____ ______ or _______ and then back to the GI tract:
Control gastric motor and secretory activity
Pain reflexes
Defecation reflex
Spinal cord
Brainstem
What reflex is STRETCHING of the intestinal wall during the passage of a bolus triggers a reflex?
Peristaltic
STRETCHING of the intestinal wall during the passage of a bolus triggers a reflex that constricts the lumen behind the bolus and dilates the lumen ahead of it —> coordination of longitudinal and circular musculature —> ________ movement of chyme
Propulsive
What is a property of many syncytial smooth muscle cells (bile duct, ureters)?
Peristalsis
Simulation at any point in the gut can cause a ________ ring to appear in the circular muscle spreading them along the gut tube
Contractile
Behind the site of distention =
Longitudinal muscle _______
Circular muscle ______
Relaxes
Contracts
Distal to the site of distention=
Longitudinal muscle ________
Circular muscle ________
Contracts
Relaxes
What do excitatory motor neurons release (2)?
ACh and SP
ACh and SP = __________ of circular muscle behind the chyme and ___________ of longitudinal muscle after the chyme
Contraction x2
What type of motor neurons are NO, ATP, and VIP?
Inhibitory
NO, ATP, VIP = __________ of longitudinal muscle behind the chyme and ___________ of circular muscle after the chyme
Relaxation x2
What reflex refers to the GI tract reflex where afferent and efferent fibers of the vagus nerve coordinate responses to gut stimuli via the dorsal vagal complex in the brain?
Vagovagal
Vagovagal reflex:
The __________ relaxation of the stomach in response to mastication of food and deglutition
Receptive
