Knes 348 Exam 3 Questions with 100% Correct Answers.
Respiratory Exchange Ratio - Correct Answer The ratio between the amount of carbon
dioxide (CO2) produced in metabolism and oxygen (O2) used. The ratio is determined by
comparing exhaled gases to room air. RER is 0.8 at rest. RER of .7 means fat is the
primary fuel source and 1 or above means mostly carbs. VCO2/VO2
How is RER used to determine the oxidation of carbohydrate and fat? - Correct Answer
Measuring this ratio can be used for estimating the respiratory quotient (RQ), an indicator
of which fuel (carbohydrate or fat) is being metabolized to supply the body with energy. The
amount of oxygen used during metabolism depends on the type of fuel being oxidized. In
general, the amount of oxygen needed to completely oxidize a molecule of carbohydrate or
fat is proportional to the amount of carbon in that fuel. For example, glucose (C6H12O6)
contains six carbon atoms. During glucose combustion, six molecules of oxygen produce
six CO2 molecules, six H2O molecules, and 38 ATP.
What is EPOC? - Correct Answer EPOC is the amount of oxygen required to restore your
body to its normal, resting level of metabolic function
How does EPOC affect ATP/pcr? - Correct Answer New ATP is synthesized and some of
this ATP donates phosphate groups to creatine until ATP and creatine levels are back to
resting state levels again. Another use of EPOC is to fuel the body's increased metabolism
from the increase in body temperature which occurs during exercise.
Discuss several possible reasons why blood lactate begins to rise rapidly during
incremental exercise. - Correct Answer Increasing reliance upon anaerobic mechanisms
due to the higher ATP needs of more intense exercise, Glycolysis occurring too rapidly
even with sufficient oxygen, Epinephrine and norepinephrine are secreted with higher
intensity exercise and increase glycolysis, FT fibers begin to be recruited, and Decreased
blood flow to lactate clearing tissues (liver)
Describe the restoration of the phosphagen stores with regard to (a) the time involved and
(b) the energy system used. - Correct Answer Replenished by the aerobic system, ATP is
formed through the aerobic
system and this is used to restore CP (Creatine phosphate?). Half time is about 30
seconds and it takes 3-4 minutes for full restoration.
Half time - Correct Answer The time that is required to restore half the phosphagens that
were depleted during exercise
What is meant by rest recovery and exercise recovery, and how do they influence the rate
of lactic acid removed? - Correct Answer The removal of lactic acid following exercise is
dependent upon whether you rest or exercise during recovery. Using a rest recovery, the
half-time for lactic acid removal is 30 min. Using an exercise recovery the halftime for lactic
acid removal is cut in half, leading to a much quicker removal of lactic acid.
Respiratory Exchange Ratio - Correct Answer The ratio between the amount of carbon
dioxide (CO2) produced in metabolism and oxygen (O2) used. The ratio is determined by
comparing exhaled gases to room air. RER is 0.8 at rest. RER of .7 means fat is the
primary fuel source and 1 or above means mostly carbs. VCO2/VO2
How is RER used to determine the oxidation of carbohydrate and fat? - Correct Answer
Measuring this ratio can be used for estimating the respiratory quotient (RQ), an indicator
of which fuel (carbohydrate or fat) is being metabolized to supply the body with energy. The
amount of oxygen used during metabolism depends on the type of fuel being oxidized. In
general, the amount of oxygen needed to completely oxidize a molecule of carbohydrate or
fat is proportional to the amount of carbon in that fuel. For example, glucose (C6H12O6)
contains six carbon atoms. During glucose combustion, six molecules of oxygen produce
six CO2 molecules, six H2O molecules, and 38 ATP.
What is EPOC? - Correct Answer EPOC is the amount of oxygen required to restore your
body to its normal, resting level of metabolic function
How does EPOC affect ATP/pcr? - Correct Answer New ATP is synthesized and some of
this ATP donates phosphate groups to creatine until ATP and creatine levels are back to
resting state levels again. Another use of EPOC is to fuel the body's increased metabolism
from the increase in body temperature which occurs during exercise.
Discuss several possible reasons why blood lactate begins to rise rapidly during
incremental exercise. - Correct Answer Increasing reliance upon anaerobic mechanisms
due to the higher ATP needs of more intense exercise, Glycolysis occurring too rapidly
even with sufficient oxygen, Epinephrine and norepinephrine are secreted with higher
intensity exercise and increase glycolysis, FT fibers begin to be recruited, and Decreased
blood flow to lactate clearing tissues (liver)
Describe the restoration of the phosphagen stores with regard to (a) the time involved and
(b) the energy system used. - Correct Answer Replenished by the aerobic system, ATP is
formed through the aerobic
system and this is used to restore CP (Creatine phosphate?). Half time is about 30
seconds and it takes 3-4 minutes for full restoration.
Half time - Correct Answer The time that is required to restore half the phosphagens that
were depleted during exercise
What is meant by rest recovery and exercise recovery, and how do they influence the rate
of lactic acid removed? - Correct Answer The removal of lactic acid following exercise is
dependent upon whether you rest or exercise during recovery. Using a rest recovery, the
half-time for lactic acid removal is 30 min. Using an exercise recovery the halftime for lactic
acid removal is cut in half, leading to a much quicker removal of lactic acid.
