click below
click below
Normal Size Small Size show me how
68C Ch.15 Ph.1 T.7
Hole's Essentials of A&P Chapter 15: Digestion and Nutrition
Question | Answer |
---|---|
Assimilation | changing absorbed substances(nutrients) into chemically different forms for use by cells |
Absorption | movement of nutrients, from inside intestines into circulating fluids of the body |
Digestion | process of altering chemical and physical composition of food so that it may be absorbed |
Mechanical digestion | process of breaking food down into smaller pieces, mixing them with digestive juices without altering the chemical composition |
Which organs of the digestive system make up the Alimentary Canal? | Mouth, pharynx, Esophagus, Stomach, Small intestine, Large intestine, Rectum, Anus |
Which organs of the digestive system make up the Accessory organs? | Salivary organs, teeth, tongue, liver, gallbladder, pancreas |
Muscular, irregular tube that is opened at both ends. Passes through the ventral cavity. | Alimentary Canal |
Name the four layers of the Alimentary Canal | 1.Mucosa 2.Submucosa 3.Muscularis 4.Serosa |
Peristalsis | propelling movements, ring of muscle contracts then relaxes causing mechanical breakdown of food |
Provide moisture and lubrication, allows organs within abdominal cavity to slide freely against one another | Serous fluid |
Forms roof of the mouth, divided into hard and soft, prevents choking | Palate |
Prevents food or liquids from entering nasal cavities | Uvula |
At what age do deciduous and permanent teeth arise? | 6 months of age, 6 yrs of age |
Secrete saliva, Amylase, stimulated by sight, smell, taste, or thought of food | Salivary Glands |
Amylase | begins chemical digestion of carbohydrates, moisten and binds food particles |
Three major Pairs of salivary glands | 1.Parotid 2.Submandibular 3.Sublingual |
Esophagus | connects pharynx with the stomach, descends posterior to the trachea, esophageal hiatus |
Lower esophageal(cardiac) sphincter | prevent stomach contents from re-entering esophagus |
Three areas of the stomach | 1. Fundus 2.Body 3.Pylorus |
Main functions of the stomach | Begins SECOND phase of digestion(breakdown of proteins), sends CHYME to small intestine |
Gastric Juices | contains hydrochloric acid and enzymes, seeing, smelling, tasting food stimulates increased production |
Activated by HCl, forms pepsin- responsible for protein digestion in stomach turning bolus into chyme | Pepsinogen |
Extends the length of pancreas, connects duodenum at major dudenum papillae | Pancreatic duct |
What are the enzymes within Pancreatic juice | 1.Pancreatic Amylase(carbohydrates) 2.Pancreatic Lipase(fats) 3.Trypsin,Chymotrypsin,Carboxypeptidase(proteins) |
Stores glycogen, synthesis of plasma proteins, excretion of bilirubin, blood detoxification | Liver functions |
Emulsification of fats and elimination of cholesterol from the body, enhances absorption of fat soluble vitamins A,D,E,K, stored in the gallbladder | Bile |
Gallbladder | Cholecytokinin of CCK, stimulate contraction of gallbladder, main function-stores bile |
Three sections of the Small Intestine | 1.Duodenum 2.Jejunum 3.Ileum |
Completes digestion, suspend from posterior abdominal wall, circular folds called plicae, millions of villi, nerve fiber transmits impulses stimulate or inhibit villus activities | Small Intestine |
Villi | increase surface area, blood capillaries, lymphatic vessels |
Undigested and unabsorbed food, absorbs water and electrolytes, forms/stores feces | Large Intestine |
Ascending colon | begins at cecum travels upward, becomes heptic flexure |
Transverse colon | extends across front of abdomen, becomes splenic flexure |
Which vitamins are synthesized by the large intestine | vitamin K, B12, Thiamine, Riboflavin |
Incontinence | lack of voluntary control of defecation; inability to retain feces |
Enemas | solution into colon via anus, limit use |