PSA 11 for 2020/2021 PDF

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For k103 recitation...

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Pre-Session Assignment (PSA) #11

Name Jaden Wilhelm

Complete the vocabulary-matching sections and at least the first three objectives for each chapter. Doing so will prepare you for recitations and for the quizzes. You are highly encouraged to complete the rest of the objectives to keep you on track and so you can ask for clarification during recitation. All answers can be found in the textbook, even if a section has not yet been covered in lecture. Please complete and turn in one hour before the designated weekly recitation time via canvas. Chapter 47 Objectives: Processing Food and Nutrition 1. Discuss the differences between having no digestive tract, an incomplete and a complete digestive tract and any benefits or advantages they provide Invertebrate animals like poriferans and protists have no digestive tract and process food by phagocytizing material. The food goes through digestion by lysosomes. Invertebrate animals like cnidarian have incomplete digestive tracts. This is a single opening to GI tract cavity. It starts with extracellular and ends with intracellular and they have a mouth and no anus. Complete digestive tracts happens in most invertebrate and all vertebrate animals. The digestion is extracellular within intestine and they have a “beginning” and “end” opening. 2. Trace the pathway traveled by an ingested meal through the human digestive system, and based upon class discussion, be able to describe the structure and function of each organ and the enzymes involved in digestion (drawing helpful!) The food processing that happens in the mouth and the enzymes that are involved are amylase and lingual lipase. After that the food goes to pharynx and esophagus. The esophagus connects to stomach. In the stomach, the food will go through several processes. There, the food will be analyzed and converted to pepsin. In the intestine the intestinal chemoreceptors detect the glucose and fatty acids in the food and digest it.

3. Compare and contrast the digestion and absorption of carbohydrates, proteins, and lipids (table helpful!) Carbohydrates give the body energy. The enzymes involved in digestion are secreted by epithelial cells and they secrete enzymes such as lactase, maltase, and sucrase. The absorption of proteins involve peptidases. And the digestion and absorption of lipids involve lipases such as cholestrolase and phospholipase.

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