SLICEdigestive+system+review

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 is when unit molecules produced by the digestion cross the wall of the GI tract and enter the cells lining the tract, this is where nutrients enters the blood stream to be carried to the cells. If it were not for the absorption process, all the nutrients that our bodies break down with enzymes would never even get to the cells.

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 mechanical and chemical break down with chewing and saliva. Pharynx, where the mouth and nasal passages lead to. The food passages and air passages also cross in the pharynx Esophagus, the long narrow tube that takes food to the stomach. Stomach, the thick walled j shaped organ that lies on the left side of the body beneath the diaphragm the stomach is continuous with the esophagus above and the small intestines below. The stomach stores food initiates the digestion of protein an controls the movement of chyme into the small intestines. The small intestine, digestion is completed in the small intestine. The small intestine contains enzymes to digest all types of foods, mainly carbohydrates, proteins and fats. Large intestines, where you defecate from.

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- salivary amylase – mouth – starch + H2O = maltose Pancreatic amylase – small intestine - starch + H2O = maltose Protein Pepsin – stomuch – protein + H2O = peptides Trypsin – small intestine – protein + H2O = peptides Fat Lipase – Small intestine – fat droplet + H2O into monoglycerides + fatty acids

4. Why are the pancreas, liver, and gall bladder considered accessory organs of digestion and not an organ of digestion? (152) 	They are considered accessory organs because they never actually touch waste or food, they only secrete fluids into the system to help digest the food. They aid the digestion but they do not take part directly.

5. What is the chief contribution of each of these in the body--carbohydrates, proteins, and lipids (fats)? (158-59) Carbs – they provide the body with energy Proteins – they are the building blocks of the body

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

09) D 10) D 11) B 12) E 13) B 14) E 15) A 16) E 17) B 18) D 19) D 20) E 21) C 22) E 23) B 24) C 25) D 26) A 27) D 28) B 29) D