ExPhys Ch 5: Energy Expenditure

In direct calorimetry, what flows through tubing in the walls?

• Air

• Water

• Oil

• Gas

What is a challenge of using direct calorimetry during exercise?

• It is too fast

• Heat added by exercise equipment

• It is inexpensive

• It measures heat indirectly

What is the formula for calculating V'CO₂?

• Volume of expired CO₂ - volume of inspired CO₂

• Volume of inspired O₂ - volume of expired O₂

• Rate of O₂ consumption

• Volume of expired O₂ - volume of inspired O₂

Which measurement involves the volume of inspired O₂?

• V'CO₂

• Rate of CO₂ production

• V'O₂

• Volume of expired CO₂

To calculate V'CO₂, which fraction is necessary?

• Fraction of carbon dioxide in expired air

• Fraction of nitrogen in expired air

• Fraction of hydrogen in expired air

• Fraction of helium in expired air

What is the primary focus of the document?

• Measuring energy expenditure

• Measuring water intake

• Measuring glucose levels

• Measuring protein synthesis

What does the document imply about the relationship between fuel type and metabolism?

• Different fuels require different amounts of O₂

• All fuels require the same amount of O₂

• Fuel type does not affect O₂ usage

• Only glucose requires O₂

How many molecules of ATP are produced from 1 molecule of glucose?

• 16

• 32

• 129

• 23

What is the formula for calculating RER?

• V'O2/V'CO2

• V'CO2/V'O2

• ATP/O2

• CO2/O2

What is an isotope?

• An element with a typical atomic weight

• An element with an atypical atomic weight

• A molecule with a typical atomic weight

• A molecule with an atypical atomic weight