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what supplies blood to the numerous branches of the small intestine?
superior mesenteric artery and vein
what does the mesentary proper support?
the branches of the superior mesenteric artery and vein, lymphatics and nerves that supply the jejunum and ileum
what determines the primary functions of the regions of the small intestine?
characteristics of duodendum?
1. contains duodenal (Brenner's) glands that aid the crypts in producing mucus and 2. receives the secretions of the common bile duct and pancreatic duct
what do the lamina propria of the jejunum and ileum contain?
large groups of aggregated lymphoid nodules (Peyer's patches)
functions of intestinal juice?
1. moistens the chime; 2. helps buffer acids; 3. dissolves digestive enzymes and products of digestion
what are secretin and cholecystokinin (CCK)?
2 hormones important in the coordination of digestive activities
where does large intestine begin and end?
begins as a pouch inferior to the terminal portion of the ileum and ends at the anus
main functions of the large intestine?
1. reabsorb water and compact feces; 2. absorb vitamins by bacteria; 3. store fecal material prior to defacation
how does colon differ in structure from small intestine?
it has a larger diameter and thinner wall than small intestine
what are major histological features of the colon?
1. lack of villi; 2. abundance of goblet cells; 3. distinctive mucus-secreting intestinal glands
how does movement from cecum to the transverse colon occur?
slowly, via peristalsis and haustral churning
how does movement from the transverse to the sigmoid colon occur?
several times each day, via mass movements
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