HTHSCI 1H06 Study Guide - Midterm Guide: Superior Mesenteric Artery, Superior Mesenteric Vein, Inferior Mesenteric Vein

117 views11 pages

Document Summary

Afferent stimulation of medulla- irritant fibres within gastric mucosa will send signals up to medulla to stimulate vomiting centre. Ipecac- syrup will induce vomiting- stimulates irritant receptors lining gastric mucosa. The only place for gastric contents to go is up the esophagus and past the gums (projectile vomiting) It is most common in first male babies. If mild, wait if severe, treatment by slitting the pyloric sphincter. Mechanical digestion- mastication (chewing), continued in blender of stomach, segmentation in small intestine- circular layer of muscle lining wall of small intestine will contract at alternating places- helps to break up food occupying lumen of small intestine. Villi (microvilli- brush border)- finger-like projections in mucosal layer- on villi, each individual cell"s apical surface has a lot of folding- increases surface area- looks fuzzy, called brush border (technical term- microvilli) Small intestine suspended from posterior abdominal wall by mesentery, which is a perfect highway for blood vessels, nerves, and lymphatics servicing wall of intestine.