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Phys4 GI Intro

Phys4 Overview of GI function

3 main phases of digestion 1.Cephalic (food outside the body, senses are stimulating activation). 2.Gastric (food in the stomach). 3.Intestinal (chyme moving through the Intestines, abrosorption). **All 3 are ALWAYS ongoing.
Cephalic phase of digestion The senses (sight, smell, thought, sound) trigger responses in anticipation of food: 1.Salivation. 2.Vagal activation of Orad & Cuadad stomach, pancreas, liver, and GB.
What are the 3 main functions of saliva 1.Lubrication. 2.Protection. 3.Digestion.
Main contents within saliva 1.Enzymes (amylase for carb digestion). 2.Mucous. 3.Bicarb. 4.Antibacterial agents.
Main stomach secretions 1.Pepsin. 2.Acid. 3.IF. 4.Mucous. 5.Hormones.
Functions of the Orad Stomach Upper part of stomach that: 1.Accomadates. 2.Digests. 3.Delivers to small intestine.
Functions of the Caudad Stomach Lower part of stomach 1.Mix. 2.Grind. 3.Deliver to small intestine.
Do they Orad and Caudad stomach work together? YES, they both help to deliver food to the small intestine.
Main Pancreatic secretions EXOCRINE PANCREAS secretes: 1.Digestive enzymes. 2.Bicarb.
Main liver/GB secretions 1.Bile. 2.Bicarb.
Key sensory receptors found in the GI 1.Stretch. 2.pH. 3.Osmolality. 4.Chemo. **contribute to regulation hormone release.
Where will you find striated muscle in the GI? 1.Pharynx. 2.Upper Esophagus. 3.External Anal Sphincter
What is the difference b/w Intrinsic and Extrinsic nervous systems in the GI? EXTRINSIC: the SNS & PNS which modulate the Intrinsic system. INTRINSIC: (Enteric) is w/in the gut wall and serves as the "brain" of the GI. It initiates neural signals & motility, adjusting function on its own.
Where all do the GI sensors in the duodenum send signals to? They send neural & hormonal signals to: 1.Pancreas. 2.Liver. 3.GB. 4.stomach. **These neuronal reflexes influence secretions & motility.
Main function of Small Intestine 1.Primary site for absorption & digestion. 2.Majority of WATER absorption. **Mostly completed by the end of jejunum.
What does the Iliocecal reflex influence? Gastric emptying and motility. **If it is stimulated by passing food, it signals to stop emptying and fod delivery.
Main function of Large Intestine 1.Absorbs water and electrolytes. 2.Packs & Evacuates (biggest job)
Created by: WeeG



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