PSIO 420 exam 1 key - PSIO 420/520 practice problem set #1:...

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PSIO 420/520 practice problem set #1: Bioenergetics 1. The following figure illustrates the relationship between average running speed and exercise duration, using a logarithmic scale, for men’s track events. Based on your knowledge of cellular ATP synthesis, indicate the energy system that is most responsible for the ATP yield for each curve component. A: Creatine phosphate Average running speed B: Anaerobic glycolysis C: Aerobic metabolism Exercise duration (log scale) 2. Answer the following questions based on your understanding of the contribution of each energy system to ATP yield during exercise. Note: CP = creatine phosphate; GLY = glycolysis; AER = aerobic metabolism. a. Which energy system yields ATP at the fastest rate ? CP GLY AER b. Which energy system is most limited by total quantity of available substrate? CP GLY AER c. Which energy system(s) has no oxygen requirement ? CP GLY AER d. Which system’s contribution to ATP yield is measured via indirect calorimetry ? CP GLY AER 3. a. Direct calorimetry is a technique used to measure metabolic rate by directly measuring what variable? Measured variable: heat release b. Is direct calorimetry a reliable means to evaluate metabolism during exercise? Circle one: YES NO Why or why not? During exercise, heat released is not equal to heat produced (body temperature increases, ergometer’s mechanical friction). 4. Answer the following questions based on your knowledge of the respiratory exchange ratio (RER). a. Write the equation used to calculate the RER. VCO 2 /VO 2 b. For what purpose is the RER used (i.e. what information does it provide)? Indicates substrate use c. List two conditions in which the RER may be falsely elevated. 1.
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This note was uploaded on 05/13/2008 for the course PSIO 420 taught by Professor Keen during the Spring '08 term at University of Arizona- Tucson.

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PSIO 420 exam 1 key - PSIO 420/520 practice problem set #1:...

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