Digestive+System+Review+AG

Allie Gruber Human Bio Field Period 1 September 9, 2008

Digestive System Review

1. Argue that absorption is the most important of the five processes of digestion over the other four processes. (144-45)	Absorption occurs as unit molecules produced by digestion cross the wall of the GI tract and enter the cells lining the tract. Of the five processes, absorption is the most important because from the tract, the nutrients enter the blood for delivery of the cells, therefore without this process the cells would never be transferred.

2. List the main organs of the digestive tract and state the contribution of each to the digestive process. (146-54) 	Mucosa is the inner mucous membrane layer that is modified according to the digestive organ. Submucosa is a broad band of loose connective tissue that contains nerves, blood and lymphatic vessels. Muscularis is the two layers of smooth muscle and Serosa is a thin outermost tissue that is the visceral peritoneum that secretes a serous fluid.

3. Name the enzymes involved in the digestion of starch, protein, and fat, and tell where these enzymes are active and what they do. (151) 	Salivary amylase produced by salivary glands is the enzyme involved in the digestion of starch in the mouth. In the protein digestion; pepsin is the enzyme produced by gastric glands that act in the stomach. In the fat digestion the lipase is the enzyme that is produced by pancreas in the small intestine.

4. Why are the pancreas, liver, and gall bladder considered accessory organs of digestion and not an organ of digestion? (152) 	The pancreas, liver & gall bladder only create and store the elements that’s go inside the tube to the digestive system rather than function as part of the tube itself.

5. What is the chief contribution of each of these in the body--carbohydrates, proteins, and lipids (fats)? (158-59) 	Carbohydrates are the energy source of the body, proteins contribute as enzymes that suppy the essential amino acids that allow the body to grow healthy, and lipids (fats) serve as the body’s source of cell membranes.

Do the multiple choices on page 167-68. Just write the number and your answer.
 * 1) 9 to 29.

9. d 10. a 11. b 12. e 13. c 14. a 15. b 16. e 17. d 18. d 19. d 20. c 21. c 22. e 23. b 24. c 25. d 26. a 27. a 28. b 29. c