Human Digestive System Overview

Cephalic phase = Begins with secretions from gastric glands in response to the sight and smell of food Gastric phase = Happens in the stomach where food is further broken down by mixing with gastric acid Intestinal phase = Begins in the duodenum where partially digested food is mixed with enzymes produced by the pancreas Mouth phase = Includes the mechanical breakdown of food by chewing and the chemical breakdown by digestive enzymes

Pancreas = Produces a number of enzymes for mixing with partially digested food in the duodenum Liver = An accessory organ of digestion involved in producing bile for fat digestion Salivary glands = Secrete amylase and lingual lipase for chemical breakdown of food in the mouth Gallbladder = Stores and concentrates bile produced by the liver

Chewing = Mechanical breakdown of food that begins in the mouth and produces a bolus for swallowing Mixing with gastric acid = Occurs in the stomach to further break down food before it enters the duodenum Enzyme mixing in duodenum = Partially digested food is mixed with enzymes produced by an organ at this stage Secretions from gastric glands = Initiates the cephalic phase of digestion in response to the sight and smell of food

<p>Amylase = Secreted by salivary glands for chemical breakdown of food in the mouth Lingual lipase = Secreted by serous glands on the tongue for chemical breakdown of food in the mouth Gastric acid = Mixes with food in the stomach to further break it down before entering the duodenum Pancreatic enzymes = Produced by an organ and mixed with partially digested food in the duodenum</p> Signup and view all the answers

<p>Bolus = Produced during chewing in the mouth and swallowed down the esophagus into the stomach Duodenum = First part of the small intestine where partially digested food is mixed with enzymes Esophagus = Tube through which the bolus is swallowed down to enter the stomach Saliva = Contains amylase and lingual lipase for chemical breakdown of food, and initiates mechanical digestion</p> Signup and view all the answers