BIOL 1344 Lecture Notes - Lecture 5: Maltase, Muscle Tone, Carbonic Anhydrase
26 Jul 2018
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30ft; 1/3 length in living state (10-12 ft). This is due to muscle contraction (muscle tone) Food intake --> masticate (chew food) with teeth and saliva --> then deglutiton (swallowing) --> then motility (aka peristalsis = contraction/relaxtion of the muscles of. There are hormones that regulate motility: motilin, vip (vasoactive interstinal polypeptide) Food can go through the gi tract faster or slower in peristalsis: Enteric nervous system: nervous system in the gi tract. Controls secretions from gi tract (such as bicarbonate, mucus, etc) Myenteric plexus (auerbach"s complex): they are between circular muscles and longitudinal muscles. Secretions: saliva (1. 5-2 liters saliva) i. parotid salivary glands ii. All salivary amylase (enzyme that catalyzes the starch into sugars) Use mmr shot to prevent mumps in parotid salivary glands. Secretes bile ---> needed for emulsification of fats (break fats into smaller pieces) (fat. The lipid and bile are called micelles: micelles + lipase ---> lipids are hydrolyzed.
