1 a. What are three of the safeguards that prevent us from digesting our own tissues? b. Explain how positive and negative feedback mechanisms work. c. Is positive feedback or negative feedback more common in animals? d. Why is one mechanism more common than the other in animals?
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1 a. What are three of the safeguards that prevent us from digesting our own tissues?
b. Explain how positive and negative feedback mechanisms work.
c. Is positive feedback or negative feedback more common in animals?
d. Why is one mechanism more common than the other in animals?
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- From the moment you start to eat an apple, different organs in the body work together to complete the process of digestion. What is the advantage of having multiple organs in the process of digestion? A. The process is more energy-efficient, and organs can perform more than one function simultaneously B. Different systems can compensate for another if the responsible system fails C. Different organs act independently as a transportation system until digestion is complete D. Each organ has a specific function and is specialized to allow the body to supply the correct nutrientsA. What is/are the primary role(s) of the large intestine? a. to complete enzymatic digestion and store indigestible material b. to initiate enzymatic digestion of carbohydrates and to store water c. to absorb water from digested material, with essentially no digestive role of its own d. to secrete water into the material that is left over after all available nutrients have been absorbed e. to digest fats A. In the intestine most nutrients are absorbed regardless of whether the body has an immediate need or shortfall of them; ie there is little control over amounts taken up – which of the following does not follow this rule? a. absorption of sodium b. absorption of water c.absorption of iron d. absorption of fat soluble vitamins e. none of the above follow this rule – close control is exerted over all of themWhich of the following might be true of an individual unable to synthesize and secrete intrinsic factor? a. They would be unable to absorb adequate amounts of vitamin B12. b. They would be unable to digest lactose found in dairy products. c. They would be unable to absorb amino acids in the small intestine. d. They would be unable to digest and absorb triglycerides
- Which of the following best describe the function of goblet cells in the digestive tract? A. produce mucus that protects parts of the digestive organs from the effects of powerful enzymes needed for food digestion B. secrete buffers in order to keep the pH of the digestive tract close to neutral C. provide protection against invading bacteria and other disease-causing organisms that enter the digestive tract in food D. absorb nutrients from digested food and store them for future useFill in the blanks: A B C D Specify C Posteriorly, C connects with the next digestive organ called theThe purpose of Microvilli in the human digestive tract is to: a. kill detrimental bacteria in the esophagus b. emulsify fats c. secrete pepsinogen in the stomach d. absorb nutrients from the small intestine into the bloodstream e. secrete trypsinogen and chymotrypsin into the duodenum
- 1. Go to this figure shown below in your textbook. Examine each of the layers that make up the wall of the gut. You can think of these as concentric tubes, shown below. Label each of these layers, and indicate what type(s) of tissue or specialized cell(s) are contained in each. If a layer is subdivided into even more layers, add this to your label. If there are nerve plexi or specialized structures within or between layers, indicate this also. Aside from the mouth, name one other region of the gut does not fit this particular scheme? How does it differ? (CCCO Copyright © McGraw-H Education. Permission required for reproductioOne-way passage of food through the digestive system of many animal groups allowsa. intracellular digestion.b. specialization of different regions of the digestive system.c. release of digestive enzymes into the gut.d. extracellular digestion.Which of the following statements is true?a. Intracellular digestion commonly occurs in vertebrates.b. Absorption of nutrients always requires active transport.c. Alimentary canals have two openings, whereas gastrovascularcavities have only one.d. Extracellular, but not intracellular, digestion requires hydrolyticenzymes.e. Most minerals are absorbed by simple diffusion.
- Choose is constructing a diagram of the digestive tract of cattle. Her diagram includes a rumen, which is a pouch-like extension of the esophagus. Which addition to the diagram would be most useful to model the function of the rumen in food digestion?At which stage do nutrients enter an organism’s bloodstream?a. Ingestionb. Digestionc. Absorptiond. EliminationExperiments have been done on mice where they take away nucleic acids from their diets. Their findings showed that the mice without nucleic acids in their diet grew more slowly and also has shorter villi in their small intestines. Why might it make sense that a mouse with shorter intestinal villi would have slower growth? 1-Shorter villi in the small intestine would mean a reduced ability to absorb food only. 2-Shorter villiv inthe small intestine would mean a reduced aboilty to dihgest food and a reduced ability to absorb food. 3-Shorter villi in the small intestine would mean a reduced ability to digest food only. 4-shorter villi in the small intestine would mean a reduced ability to digest food and an increased ability to absorb food.