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Digestion Process: Crohn's Disease, Proton Pumps, Aspirin

Questions for the Digestive tract

1. Pretend you are a piece of solid food. Describe:

a. The process of being chewed. Swallowed, and the events that occur in stomach until you are squirted as chime into the duodenum (secretions, and the digestive process).

b. Pretend you are in the duodenum. What enzymes are secreted? Where do the enzymes come from? What is the pH in the chime as it comes out of the pyloric sphincter?

c. Pretend you are now digested into small molecules of fat, protein and carbohydrate. Describe how you now are absorbed into the blood.

2. How do proton pump inhibitors like Nexium work on ulcer? Why does aspirin increase stomach acid and decrease mucus secretion? How do Prilosee and Pepcid AC work? What does bismuth do for ulcers?

3. What are the major cause and symptoms of Crohn's disease? How does Crohn's differ from ulcerative colitis in location and disease manifestation?

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Questions for the Digestive tract

1. Pretend you are a piece of solid food. Describe:
a. The process of being chewed. Swallowed, and the events that occur in stomach until you are squirted as chime into the duodenum (secretions, and the digestive process).
As food is chewed, saliva is produced (it is also produced just by smelling food). Saliva contains compounds and enzymes that break down food. Your teeth help to make the food into smaller, more manageable pieces (by grinding and mashing the food) so that the digestive enzymes can further break food down. Substances are also released to disinfect and neutralize acidity (potassium bicarbonate, lysozyme). The tongue molds the softened food into a ball or bolus for swallowing. When you swallow, the food passes into the pharynx. The passages to the lungs and nose are closed, so the food then enters the esophagus, a muscular tube that moves food to the stomach. This is performed through a series of muscle contractions called peristalsis. At the bottom of the esophagus is a ring shaped muscle called the lower esophageal sphincter, which relaxes to let food into the stomach, and closes to prevent vomiting.

Once the food arrives in the stomach, the muscular walls churn the food into a liquid-like substance called chyme, a semi-fluid mass of partly digested food. The stomach also secretes additional enzymes (pepsinogen, renin) and acids (hydrochloric acid) that help break down proteins, fats, and alcohol. Gelatinase helps to digest meat, gastric amylase digests starch not yet digested by mouth, and gastric lipase digests butter fat. The stomach can expand or contract depending upon how much food it contains. The stomach is lined with mucosa, a membrane that secretes a protective substance (mucus), which protects the stomach lining. Solid food can remain in the stomach for up to 5 hours. ...

Solution Summary

This detailed solution describes the digestion process in detail. It also explains how proton pump inhibitors like Nexium work on ulcers, and why aspirin increases stomach acid and decreases mucus secretion. It explains how Prilosee and Pepcid AC work and what bismuth does for ulcers. It describes the major cause and symptoms of Crohn's disease and explains how Crohn's differ from ulcerative colitis in location and disease manifestation. APA references are included.

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