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EXPH 386 Exam 2 Questions and Answers
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EXPH 386 Exam 2 Questions and Answers
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EXPH 386 Exam 2There is a very limited amount of high-energy phosphate (ATP and CP) stored within the muscle. How
many moles of ATP per kg of muscle is stored? - Answer-Approximately 3-8 mmol of ATP per kg of
muscle
Around how long can you perform physical activity just off of the stored ATP and CP? - Answer-Enough
to walk briskly for 1 minute, run a cross-country race for 20-30 seconds, or perform all-out exercise
(sprint) for approximately 5-8 seconds
The maximum rate of energy transfer from the intramuscular high-energy phosphates exceeds by how
many times the maximal energy transfer from aerobic metabolism? - Answer-4-8 times
In order to sustain exercise or recover from short all-out efforts, we must use what pathways as a
secondary energy source to replenish the ATP? - Answer-Glycolysis pathways
Where does the energy to replace these high-energy phosphates during strenuous exercise come from
primarily? What does this result in? - Answer-Glucose and stored glycogen during the anaerobic process
of glycolysis; results primarily in the formation of lactic acid
When are the most rapidly accumulated and highest blood lactic acid levels reached? - Answer-During
maximal exercise that can be sustained for 60-180 seconds
, At what percentage of the healthy, untrained person's maximal aerobic capacity does blood lactate
begin to accumulate and rise in an exponential fashion? - Answer-50-55%
Why does the blood lactate threshold occur at a higher percentage of a trained athlete's aerobic
capacity? - Answer-Genetic endowment (type of muscle fiber), adaptations that cause less lactic acid
production, and greater rate of removal
What may cause adaptations and increased rate of removal? - Answer-Increased capillary density,
increased number and size of mitochondria, increase in aerobic enzymes and transfer agents
What do these adaptations serve as? - Answer-To increase the cells' capacity to generate ATP
aerobically and delay the onset of blood lactate accumulation
What percentage of maximal capacity for aerobic metabolism can trained athlete's perform at before
significant increases in blood lactate occur? - Answer-80-90%
It is believed that training might enhance the ability to utilize lactic acid formed in one part of a working
muscle by other fibers in the same muscle or other _____ ______ tissues - Answer-Less actuve
Aerobically trained athletes have a VO2 Max of __% initially - Answer-60%
After well trained athletes perform maximal short-term exercise, their blood lactate levels are 20-30%
higher than those of - Answer-untrained subjects
Steady State (Rate) - Answer-balance between the energy required by working muscles and the rate of
ATP production via aerobic metabolism
Oxygen deficit - Answer-"The difference between the total O2 consumed during exercise and the total
that would have been consumed had a steady rate of aerobic metabolism been reached immediately."
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