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Unformatted text preview: EXERCISE 1 Page 4 of 7 Group Members: _________________________________________________Exercise_______Date: ___________ LI ______________________ Unique __________ Day: __________ Room: _______ Lab Start Time ________ Group Members: _______________________________________________________________Date: ___________ LI ______________________ Unique __________ Day: __________ Room: _______ Lab Start Time ________ Exercise 8 Analysis To be completed as a group and turned in at the beginning of your next laboratory period. Include your Data & Results, sketches, acquired digital images, etc. as directed by your laboratory instructor. Show your work for all calculations and/or print your MS Excel &#226; data sheets. Be sure to include proper units where necessary. Adhere to Universitys Honor Code and course policies. Balance between brevity and completeness. 1. As illustrative example of the structure-function principle, briefly relate (1-2 sentences) how the rats external anatomy of the rat equip it for its life style/dietary habits. In other words, relate how is the rat equipped to harvest, ingest, and digest the food necessary for its survival. Also describe the types of food rats eat and the time of day rats are active. Since rats have poor vision, they rely primarily on their sense of touch and smell in order scavenge for food, which is especially useful since they are nocturnal animals and can thus navigate in the dark. Rats ( Rattus norvegicus ) can eat anything they can find. If the rats live near trash, they will dig through the trash and eat whatever is edible, like cereals, oatmeal, etc. However, if they encounter new food, they will first taste a small portion of it and if they find that they do not become ill, then they will eat the new food. The rats taste a small portion because they are unable to vomit; therefore, if the food is poisoned, then they would die. 2. Trace the pathway of the nutrient products of digestion of a meal eaten by a rat, in a maximum of 5 numbered steps, from the oral cavity to a leg muscle cell. The rats digestive process is very similar to human 1. The rat chews or macerates food into slurry capable of being swallowed. The mouth also do chemically breakdown of food by enzymes that produced by salivary glands. 2. Food then swallowed down to the digestive pathway. Epiglottis closes to help preventing food entering into the pharynx. Food passes down through esophagus into the U-shaped stomach. 3. Stomach produce gastric juice (very acidic) to help break down food even further and also mechanically turning the food. After food being broken in the stomach, it then pushed down to the small intestine. 4. Small intestine completely break down the food by different enzymes produced in the pancreas. The liver produces bile for fat digestion; however, unlike human, rats dont have gallbladder to store the bile (the bile goes directly to the small intestine)....
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- Spring '10