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Nutrition and Digestion

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Module 2 Written Assignment

1. What are enzymes? What specifically is the role of an enzyme in digestion?

Enzymes are working proteins that facilitate chemical reactions without being changed in the process. Organs of the digestive system excrete digestive juices, which contain enzymes that break the bonds of nutrients that can be absorbed.

2. Trace the path of a cheeseburger and fries through the digestive tract. Indicate each place where mechanical digestion, chemical digestion, and absorption occurs FOR EACH NUTRIENT (carbohydrates, lipids, proteins). Be sure to fully explain the role of EACH organ involved (including the pancreas, liver, and gallbladder).

In the mouth – food is crushed and chewed by teeth (mechanical digestion) and moistened with saliva. The carbohydrate-digesting enzyme of saliva begins to break down the starch (chemical digestion) of the hamburger buns and fries to sugars. When swallowing, the tongue forces the food mass into the back of the mouth and the food moves through the esophagus to the stomach by peristalsis.
In the stomach – Food collects in the upper area of stomach where is it mixed and mashed (mechanical digestion) and starch continues to be digested until cells in the stomach release a strong acid mixture of gastric juice, water, HCl and enzymes to initiate protein digestion from bread and meat (chemical digestion), creating chyme. Peristalsis also aids in moving the chyme from the stomach to the small intestine (mechanical digestion). Fat follows quickly behind.
In the small intestine – As chyme arrives, hormonal messengers signal the gallbladder to secrete bile through a duct into the small intestine, mixing fat from the meat, cheese and fries (oil) with the watery digestive fluids (chemical digestion). The bile emulsifies fats, which help in the absorption of fatty acids, cholesterol and some vitamins. The

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