Digestive+system+review

1. Argue that absorption is the most important of the five processes of digestion over the other four processes. (144-45) Absoption is the most important part of the five processes of digestion because the unit molecules produced by digestion cross the wall of the Gi tract and enter the cells lining the tract. The nutrients then enter the blood for delivery to the cells. The human digestive system can not receive any nutrients from nutrients if it is not absorbed. 2. List the main organs of the digestive tract and state the contribution of each to the digestive process. (146-54) Mouth - Receives food and begins the process of mechanical and chemical digestion. Pharynx and Esophagus - Pharynx a cavity where the mouth and nasal passages both lead Esophagus - long narrow tube that takes food to the stomach Stomach - The stomach stores food, initiates the digestion of protein and controls the movment of chyme into the small intestine. Small Intestine - Digestion is completed in the small intestine Large Intestine - Absorbs water 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) Starch is digested to glucose which is actively transported into the cells of intestinal villi. Proteins are digested to amino acids which are actively transported into the cells of intestinal villi Fats are emulsified by bile and digested to monoglycerides and fatty acids 4. Why are the pancreas, liver, and gall bladder considered accessory organs of digestion and not an organ of digestion? (152) They aid in digestion as opposed to digesting anything 5. What is the chief contribution of each of these in the body--carbohydrates, proteins, and lipids (fats)? (158-59) Carbohydrates - Energy source for the body Proteins - Essential to supply the essential amino acids build muscle Lipids - Two fatty acids must be eaten from lipids because the body cannot produce them, fat also protects vital organs.
 * Digestive System Review**

9 - D 10 - A 11 - B 12 - E 13 - C 14 - A 15 - A 16 - E 17 - D 18 - D 19 - E 20 - E 21 - C 22 - E 23 - B 24 - C 25 - E 26 - A 27 - A 28 - D 29 - C
 * Do the multiple choice on page 167-68. Just write the number and your answer.**
 * 1) 9 to 29.