NPB 010 Lecture 27 Digestion PDF
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Uploaded by CongratulatoryGauss
UC Davis
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Summary
These notes cover the four basic functions of the digestive system: digestion, absorption, motility, and secretion. They include mechanical and enzymatic digestion, absorption across cell membranes, and the movement and mixing of food within the digestive tract. The notes also touch upon the role of hormones in coordinating digestive functions.
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projector was off X 12/6/24 ① NPB 010 Lecture 27 Due to a technical issue this is not recorded instead we DIGESTION ,...
projector was off X 12/6/24 ① NPB 010 Lecture 27 Due to a technical issue this is not recorded instead we DIGESTION , wrote while board notes & I copied these here. 4 Basic functions of digestive system DIGESTION Continued Split into mechanical - chewing got knea- Cenzy , matic ding Digesting - -- : ↳ movin : amylase carbohydrates Stomach acid protein anti bacterial small intestine pancreatic enzymes 3 · eg lipase lipid peptidas J protein neutralize pancicatic juices 3 · bicarbonate PH Also has brush border enzymes · small · intestine all & uchborder ② 2) BORTION = digested food crosses cell membrane to enter gul body ·broabsorption border cells 3 & we consider it no homeostasis in outside body this area ③ TILITY food = I gut A peristalsis/ moves food musclefightens.Tightenedare ↑ smooth along > food - -. ↓ analogy = getting ~* ⑬ toothpaste out of tube ⑬ Segmentation : breaks food apart & mixes food 3 gut - smaller particles - larger surface area This part will also be the & recording on 4) CRETION secretion out -JeriNE = of body (into Digesting food) · enzymes , digestive juices Saliva g e.. - mouth Saliva : amplace water - stomach acid trypsin - enzyme to breakdown protein small intestine : enzyme - receive bicarbonate HO- 3 to neutralize pH ⑤ secretion -docrine Le secreted into blood > Hormones coordinate digestion among different parts of digestive system. 1) Acipic food arrives in small intestine as "chyme" => small chunks of low pH low pH = signal for duodenum to secretin hormone te asks pancies for bicarl to neutralize acid. ⑯ 2) When food (fat) arrives in duodenum ↳ releases CCK Y "Cholecystekinine" I - asks pancreas for digestive enzymes. - stops bolus of food from stomach to come in - reduces feeling of hunger won't eat => you ⑦ The gots also make GLPI glucagon-like peptide 1 secreted when food is in guts ↳ cause more insulin release very safe type 2 diabetes medication $$ industry ozempic also based on g(p) = weight loss it also as suppresses appetite
