Chapters 12, 13 and 14
This week in lab, students measure their metabolic rate using indirect calorimetry. This method is used in lab because it is simpler to measure oxygen consumption versus heat production in the lab setting. Using a respirometer, the teaching assistant fills the tank with 100% oxygen, which the students breathe over a period of 4 to 5 minutes. The decrease in tank volume represents that student's oxygen consumption. From there, students can calculate their resting metabolic rate.
To examine the relationship of metabolism to surface area and body weight, the teaching assistants set up a dessicator to measure the oxygen consumption of a rat to see what the rat's metabolic rate is relative to the students'.
During this lab students also examine how the human body regulates blood glucose levels in the blood over a 90 minute period using a glucometer. One student volunteer obtains a baseline reading before quickly drinking a 20 oz. Mountain Dew. Every 30 minutes after that, the student will determine the glucose concentration so the class can observe changes in blood sugar levels.
Topics to Review Before Lab:
- Types of metabolic reactions
- Anaerobic and Aerobic Respiration
- Pathways using Acetyl CoA
- Preferred energy source fo different organs
- Insulin regulation
- Diabetes mellitus (Type I vs Type II)