KIN 232 Lecture Notes - Lecture 17: Sphincter, Ghrelin, Intrinsic Factor
Document Summary
Kin 232 (look at slide and listen to recording) Absorption: small intestines: requires large surface area, cooking increases absorption. Secretion: delivery of enzymes, mucus, ions, etc. into the lumen, and hormones into blood. Absorption: transport of water, ions and nutrients from the lumen, across the epithelium and into blood. Motility: contraction of smc in the wall of the tube that crush, mix and propel its contents. Saliva glands: parotid gland, submandibular gland, sublingual gland: assisted by mechanical stretch of tongue. Saliva 98% water: antibacterial isozyme, salivary amylase. Breaks down complex carbs into disaccharides (e. g. , sucrose) and then broken down to monosaccharides (glucose & fructose). No sugar is absorbed in mouth, just broken down. Iga antibodies: babies can"t produce yet but can get in breast milk: has bicarbonate in it balances out stomach acid electrolytes: slightly alkaline to moisten food. Salivation initiated after food is ingested and activates chemo/pressure receptors which feedback to pons and medulla (salivary nuclei)
