digestive nova net

1.What is the digestive tract? long tube with food first entering it at the mouth
2.What happens to undigested materials in the digestive tract? Continues along the tube until it exits at the anus.
3.Sketch the path that food takes through the digestive tract. Be sure to include the mouth, esophagus, stomach, duodenum, small intestine, appendix, large intestine rectum, and all 4 sphincters.
4.What is the function of the mouth in the digestion process? Food enters through it and helps chew the food
5.What is the term for the small mass of food that enters into the esophagus? Bolus
6.What triggers peristalsis? The presence of the bolus in the esophagus
7.What is the function of the cardiac sphincter? Closes the entrance to the stomach and prevents its contents from reentering the esophagus.
8.What is the mucous membrane? Digestive tract.
9.How long is the small intestine? 24 ft
10.Where does most digestion and absorption of nutrients take place? Small intestine.
11.What increase the surface area of the small intestine? villi
12.What is the first section of the small intestine? What is its function? Duodenum, the duodenum is very sensitive area of the digestive tract. Its receptors can detect the presence of hypo and hypertonic solutions.
13.Where is bile stored? Gallbladder
14.What is segmentation? Grabbing a tube tightly at various places around the middle and squeezing so that its contents are broken into smaller pieces.
15.When does the ileocecal sphincter open? If the food in the small intestine begins to build up, the sphincter opens to let it through.
16.What is the function of the anal sphincter? Stops the waste from leaving the body until you want it to.
17.What is the function of the appendix in humans? Serves no apparent function in people that they know of
18.Where does digestion begin? inside the mouth
19.What is gastric juice made of? Hydrochloric acid, and enzymes
20.Where are enzymes released in the small intestine produced? Pancreas
21.What is the function of the following enzymes: amylase, lactase, maltase, sucrase, and lipase?
22.There are two ways that nutrients get into the blood stream. Describe each method. Diffuse across the intestinal membrane and into the blood simply by flowing along the concentration gradient. Other substances must be forced through the membrane against a gradient, since their concentration in the blood is already greater than it is in the intestinal lumen.