Terms in this set (24)
What is the function of the digestive system?
1) It acquires nutrients from the environment
2) anabolism-uses raw materials to synthesize essential compounds
3) catabolism-decomposes substances to provide energy cells need to function
What are the parts of the Digestive (Gastrointestinal tract)?
Oral Cavity, Teeth, Tongue, Liver, Gallbladder, Pancreas, Large Intestine, Salivary Glands, Pharynx, Esophagus, Stomach, Small Intestine
Function of Oral Cavity, Teeth, and tongue in GI Tract?
Mechanical processing, moistening, mixing with with salivary secretions
Function of liver in GI Tract?
Secretion of bile (important for lipid digestion), storage of nutrients, many other viral functions
Function of Gallbladder in the GI Tract?
The gallbladder serves for storage and concentration of bile
Function of Pancreas in GI Tract?
Exocrine cells secrete buffers and digestive enzymes; endocrine cells secrete hormones
Function of Large Intestine in GI Tract?
Dehydration and compaction of indigestible materials in preparation for elimination
Function of Salivary Glands in GI Tract?
secretion of lubricating fluid containing enzymes that break down carbohydrates.
Function of Pharynx in GI Tract?
Muscular propulsion of materials into the esophagus
Function of Esophagus in GI Tract?
Transport of materials to the stomach
Function of Stomach in GI Tract?
Chemical breakdown of materials via acid and enzymes, mechanical processing through muscular contractions
Function of Small Intestine in GI Tract?
Enzymatic Digestion and Absorption of water, organic substrates, vitamins, and ions
What are the actions of the GI Tract?
Ingestion, Mechanical Processing, Digestion, Secretion, Absorption, Excretion
Define the process of Ingestion in the GI Tract
Occurs when material enters via the mouth
Define the process of Mechanical Processing in the GI Tract
Crushing/Shearing-makes material easier to move through the tract
Define the process of Digestion in the GI Tract
Chemical breakdown of food into small organic compounds for absorption
Define the process of Secretion in the GI Tract
Release of water acids, buffers, enzymes and salts by epithelium of GI Tract and glandular organs
Define the process of Absorption in the GI Tract
Movement of organic substrates, electrolytes, vitamins and water across digestive epithelium
Define the Process of Excretion in the GI Tract
Removal of waste products from body fluids
The Digestive Organs and the Peritoneum are lined with what?
What does the serous membrane that lines the digestive organs and the peritoneum consist of?
1) Superficial mesothelium - covering a layer of areolar tissue
2) Serosa, or visceral peritoneum - covers organs within the peritoneal cavity
3) Parietal peritoneum - Lines inner surfaces of body wall
The Digestive tract consists of a ___________ which contributes to the movement of materials.
Visceral smooth muscle that is found along the digestive tract
The visceral smooth muscle of the digestive tract has rhythmic cycles of activities called _______.
Peristalsis is the is the term used to describe the ___________ which ______
waves of muscular contractions, move a bolus along the length of the tract