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Digestive system design lab

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Introduction

Design Lab #1: The Systems Name: Bagavathy Kumaraswamy Teacher: Ms. Comstock Due: Tuesday, February 17, 2009 Purpose: The purpose of this lab is for students to see and understand the affect of temperature on a healthy brown rat's (Rattus norvegicus) digestive system. Materials: -five healthy, medium-sized, middle aged, male, brown rats (Rattus norvegicus) (about 10in long and weigh 350g) -three cups of uncooked red-rice -three cups of water -five plastic reseal-able bags -five clear, plastic boxes, with a lid (length=1m width=50cm height=30cm) with holes at the bottom (approximate size of the holes=1.5cm-2cm and the holes should be 3cm apart from each other) -five clear, plastic boxes without a lid (length=85cm width=35cm height=15cm) -five rooms, each 15 square feet -->the first room should be set at -2 oC -->the second room should be set at ...read more.

Middle

-->The size of the environment that the rats will be in. II. Independent Variables -->Temperature that the rat will be in III. Dependant Variables -->How much food the rats will be eating from the 1/2 cup of rice given to them. -->How often the rats will digest their food. -->How much waste will be secreted by the rats. Procedure: 1. Place the rat and the two silver bowls into the plastic box and gently place the lid on this box. 2. Take the cardboard box, which is slightly a bit smaller then the plastic box, and place it under the plastic box. The placement of the boxes should look like so: 3. Leave the rat inside the plastic box for four hours without any food. ...read more.

Conclusion

9. Also take the wastes excreted by the rat and put it into the small reseal-able bag and label the bag "-2oC". 10. Repeat steps 5-9 for these temperatures: 5oC, 15oC, 25oC, and 35oC and make sure that you write the correct temperature on each corresponding reseal-able bag. 11. Write down all observations in a similar chart: Temperature # of times of excretion # of droppings Other observations -2oC 5oC 15oC 25oC 35oC 12. Make observations to see if there is a possible connection between temperature and how often the rat digests. 13. Now that you have completed the lab, throw the cardboard box, clean the two silver bowls, and the plastic box, and put back all the other equipment into their designated areas. 1. ...read more.

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