Biology: The Unity and Diversity of Life (MindTap Course List)
14th Edition
ISBN: 9781305073951
Author: Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher: Cengage Learning
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Chapter 39, Problem 2CT
A python can survive by eating a large meal once or twice a year. When it does eat, microvilli in its small intestine lengthen fourfold and its stomach pH drops from 7 to 1. Explain the benefits or these changes.
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Explain briefly the physiological reason for this survival rule: When left in an island with little or no freshwater, never eat solid food in large volume; eat only small portions at a time.
Experiments 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.
For people who want to lose weight, one of the most popular diets is a protein-rich, carbohydrate, and fat-free diet. One risk of this diet is the formation of kidney stones. Explain why
Chapter 39 Solutions
Biology: The Unity and Diversity of Life (MindTap Course List)
Ch. 39 - Prob. 1SQCh. 39 - Prob. 2SQCh. 39 - Prob. 3SQCh. 39 - A bird's keratin-lined _______ helps it grind up...Ch. 39 - Monosaccharides and amino acids absorbed from the...Ch. 39 - Human Adaptation to a Starchy Diet The human AMY-1...Ch. 39 - Prob. 2DAACh. 39 - Prob. 3DAACh. 39 - Prob. 6SQCh. 39 - The low pH of the _______ aids in protein...
Ch. 39 - Prob. 8SQCh. 39 - Prob. 9SQCh. 39 - Eating a healthy diet entirely of plant foods...Ch. 39 - Prob. 11SQCh. 39 - _______ is (are) a good source of omega-3 fatty...Ch. 39 - Prob. 13SQCh. 39 - Match each substance with its description. __...Ch. 39 - Match each organ with its digestive function in...Ch. 39 - Some people who have gallstones experience pain...Ch. 39 - A python can survive by eating a large meal once...Ch. 39 - Although rabbits cannot break cellulose down into...
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- Match the following: a. Stimulates milk production 1. Transport protein b. Controls carbohydrate mechanism 2. Structural protein c. Decreases urine production 3. Catalytic protein d. Hemoglobin belongs to this class 4. Storage protein e. Protein that acts as enzyme 5. Vasopressin f. Nerve impulse transmission 6. Insulin g. Keratin belongs to this class 7. Rhodopsin n. Gliadin and casein 8. Oxytocinarrow_forwardIf rats are limited to eating for one hour a day, what determines whether or not they will lose weight?arrow_forwardIn which tube is there evidence of hydrolysis of protein in peptic and pancreatin digestion?arrow_forward
- The digestive system has several important functions. The physiological processes involved in the uitlisation of food happens in a specific order. Explain why digestion needs to happen before absorption. Make use of the macronutrient proteins as an example to explain your answer and to describe its digestion and absorption in detail.arrow_forwardCats should eat more than once a day. Mention two research articles related to this topic.arrow_forwardSailors used to pack a few food items with a high caloric load to have the energy to survive the physically demanding deck work when crossing oceans. However, they felt weak after a few weeks at sea. What type of nutrients is likely missing?Do not be specific. Think of the big question, and write a short answer.arrow_forward
- A young man says that he is consuming much more protein in his diet than the recommended amount. He feels that he needs the extra amount just in case he wants to build more muscle mass in the near future. How would you respond to him? Group of answer choices It should be fine because the cells in his body will store the extra amino acids for future use. If he has excess calories in his diet, he may gain fat from converted protein. The extra protein will be used as fuel instead of carbohydrate. His body won't digest the extra protein and will eliminate the excess in feces. The excess amino acids can only be stored for up to 48 hours.arrow_forwardWhich of the following statement is correct? a. disaccharides, glucose is the main source of energy for mammals b. hunger pangs are initiated by low high-density lipoprotein in the blood c. duodenum is the smallest part of the small intestine and is the main site for absorption d. it takes 4-6 hours for the bolus to be transported in the anal canalarrow_forwardBody builders often consume Upper levels of recommended protein. Use research to debate whether or not a diet higher than 2.5 g of protein per kg of body weight is safe for the body. A. Is it detrimental to consume more than 2.5 g protein per kg of body weight? B. Which type of the various protein preparations (protein concentrate, isolates, and hydrolysates) should be consumed and why?arrow_forward
- Gut commensal bacteria are beneficial to animal nutrition including humans. For non-fermenting animals such as humans, select the answer that describes the greatest benefit of gut microflora on nutritional physiology. Select one: a. Absorption of carbohydrates b. Removal of water c. Production of some types of essential vitamins such as biotin and vitamin K d. Generation of gases necessary for proper eliminationarrow_forwardFigure 34.12 Which of the following statements about the small intestine is false? Absorptive cells that line the small intestine have microvilli, small projections that increase surface area and aid in the absorption of food. The inside of the small intestine has many folds, called villi. Microvilli are lined with blood vessels as well as lymphatic vessels. The inside of the small intestine is called the lumen.arrow_forwardFigure 16.7 Which of the following statements about the digestive system is false? a. Chyme is a mixture of food and digestive juices that is produced in the stomach. b. Food enters the large intestine before the small intestine. c. In the small intestine, chyme mixes with bile, which emulsifies fats. d. The stomach is separated from the small intestine by the pyloric sphincter.arrow_forward
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