Digestive system review GS


Grant Sanders

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 the most important out of the five processes in the digestive system because this is where all the nutrients enter into the bloodstream and allow us to eat certain foods. This is the most important process because without this, the other processes would be useless.
2. List the main organs of the digestive tract and state the contribution of each to the digestive process. (146-54)
Mouth- teeth chew food; tongue tastes and pushes food for chewing and swallowing.
Pharynx- passageway where food is swallowed
Esophagus- Passageway where peristalsis pushes food to stomach
Stomach- secretes acid and digestive enzyme for protein; churns, mixing food with secretions, and sends chyme to small intestine.
Small intestine- mixes chyme with digestive enzymes for final breakdown; absorbs nutrient molecules into the body; secretes digestive hormones into blood.
Large Intestine- absorbs water and salt to form feces
Liver- major metabolic organ: processes and stores in nutrients; produces bile for emulsification of fats.
Gall Bladder- Stores bile from liver; sends it to small intestine.
Pancreas- produces pancreatic juice: contains digestive enzymes, and sends it to the small intestine; produces insulin and secretes it into the blood after eating.
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)
The enzymes are produced by the pancreas and located in the small intestine.
Protein is called Trypsin, starch is called Pancreatic amylase, and fat is called Lipase.
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 are used for storing nutrients, and not digesting.
5. What is the chief contribution of each of these in the body--carbohydrates, proteins, and lipids (fats)? (158-59)
Carbohydrates are the preferred energy source for the body, and sufficient proteins are needed to supply the essential amino acids, and fats contain more calories than either of the two.

Do the multiple choice on page 167-68. Just write the number and your answer.
#9 to 29.
9.d 10.a 11.b 12.e 13.c 14.c 15.b 16.e 17.d 18.d 19.e 20.e
21.c 22.e 23.b 24.c 25.d 26.a 27.a 28.a 29.d