19. Nutrients that are absorbed in the small intestine are delivered to the body

Question

19. Nutrients that are absorbed in the small intestine are delivered to the body via: a) Circulatory system b) Lymphatic system c) A and B d) Only A 20. The food most likely to contain mercury, dioxins, PCBs is: a. Water from plumbing in older homes b. Vegetable and fruits grown with pesticides c. Fish from rivers, streams, lakes d. Milk from transgenic dairy cattle 21. Food is mixed with digestive enzymes and moved down the Gl by a process called: a) Peristalsis b) Digestion 22. Which of the following is a major hormone of the GI tract that triggers the stomach to release HCI? a. Gastrin b. Secretin . d. Gastric inhibitory protein 23. Which of the following are not common digestive disorders? a. Peptic ulcer and gallstones b. Constipation and GERD c. Heart disease and stroke 24. The structures of the stomach and small intestines are: a. Mucoasa, submucoasa, muscles, seroasa b. Mucoasa, muscles, seroasa c. Blood vessels, nerves endings, connective tissue 25. lleocecal valve prevents the flow of large intestine contents back into stomach. a. True b. False

Explanation / Answer

Answer1- option C

Nutrients pass through the cells of the villi and enter the blood (if the are water soluble or small fat fragments) or the lymph (if they are fat soluble). Nutrients leaving the digestive system via the blood are routed directly to the liver before being transported to the body's cells.

Answer2 - option c Mercury is abundant in aquatic environments and Dioxins are found in the fishes of certain waterways. PCBs causes liver tumor and the significant sources of PCBs residue are fishes.

Answer3- option b Digestion is a form of catabolism that is often divided into two processes based on how food is broken down: mechanical and chemical digestion. The term mechanical digestion refers to the physical breakdown of large pieces which can subsequently be accessed by digestive enzymes. In chemical digestion, enzymes break down food into the small molecules the body can use.

Answer 4- option A gastrin is major hormone which triggers the release of gastric juice which mainly contains HCl and pepsin.

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