Chapter 7 Flashcards
The RQ for carbohydrate, lipid, and protein combustion, in that order, is:
A) 1.00, 0.82, and 0.70
B) 0.82, 0.70, and 1.00
C) 1.00, 0.70, and 0.82
D) 0.70, 0.82, and 1.0
C
Knowing the steady-rate oxygen uptake to compute human energy expenditure allows
you to calculate that 1.0 liter O2 liberates:
A) 2.8 kcal when carbohydrate is metabolized
B) 4.82 kcal when a mixed diet is metabolized
C) 3.5 kcal when lipid is metabolized
D) 6.2 kcal when protein is metabolized
E) 5.4 joules when protein is metabolized
B
Which of the following is FALSE?
A) RQ for carbohydrate = 1.00
B) RQ for lipid = 0.90
C) RQ for protein = 0.82
D) RQ for a mixed diet is between 0.70 and 1.00
E) All of the answer choices are true.
B
___________ indirectly infers the body’s heat production via open-circuit spirometry.
A) R and RQ
B) R and VO2
C) RQ and VO2
D) RQ and VCO2
E) VCO2 and VO2
C
Atwater and Rosa were the first to utilize:
A) RQ to determine substrate utilization
B) open-circuit spirometry in exercise studies
C) the Douglas bag method in indirect calorimetry
D) the human calorimeter
E) closed-circuit spirometry in exercise studies
D
After high-intensity exhaustive physical activity, the body retains CO2 to:
A) replenish the bicarbonate used to buffer the lactic acid produced in exercise
B) resynthesize the lipids catabolized in physical activity
C) reload the hemoglobin in blood returning from active tissues
D) resynthesize glycogen in the Cori cycle
E) None of the answer choices is correct.
A
Respiratory quotient:
A) applies to the combustion of the macronutrients
B) averages approximately 0.70 for the combustion of lipid
C) can only be used to infer macronutrient metabolism during steady-rate exercise
D) All of the answer choices are correct
D
RQ is calculated as:
A) CO2 produced × O2 consumed
B) CO2 produced × O2 consumed × N2 correction factor
C) CO2 produced ÷ O2 consumed
D) O2 consumed ÷ CO2 produced
E) None of the answer choices is correct
C
The calorific value of 4.825 kcal per liter oxygen consumed assumes the macronutrient
mixture catabolized represents:
A) 60% carbohydrate, 40% lipid
B) 40% carbohydrate, 60% lipid
C) 50% lipid, 50% carbohydrate
D) 40% carbohydrate, 20% lipid, 40% protein
B
Which of the following statements about direct and indirect calorimetry is TRUE?
A) Closed-circuit and open-circuit spirometry are methods of direct calorimetry.
B) A human calorimeter is used for indirect calorimetry.
C) Indirect calorimetry is highly accurate and much less expensive than direct
calorimetry.
D) Direct calorimetry measures VO2 and VCO2 to estimate energy expenditure.
E) None of the answer choices are true
C
In open-circuit spirometry, the subject:
A) inhales ambient air
B) rebreathes from a spirometer containing pure oxygen
C) inhales pure oxygen from a Douglas bag
D) is always fully hydrated
A
disadvantage of closed-circuit indirect calorimetry during heavy exercise is that:
A) resistance to air flow provided by the breathing circuit can be considerable
B) the soda lime absorbent may limit the speed of CO2 removal from the breathing
circuit
C) RQ is not readily obtained to provide an estimate of the substrate metabolized
D) All of the answer choices are correct.
D
Open-circuit spirometry measures:
A) protein oxidation
B) oxygen uptake
C) carbon dioxide uptake
D) lactate accumulation
B
All energy metabolism ultimately depends on:
A) oxygen utilization
B) regeneration of STP
C) availability of SDA
D) availability of carbohydrate
E) None of the answer choices are correct
A
ndirect calorimetry types include which of the following?
A) nitrogen analysis, oxygen analysis
B) closed-circuit, direct
C) open-circuit, Douglas bag
D) bomb, closed-circuit
E) open and closed-circuit spirometry
E
