Question 42 An endurance athlete who is looking to improve her cardiorespiratory
ID: 3516341 • Letter: Q
Question
Question 42
An endurance athlete who is looking to improve her cardiorespiratory fitness by optimizing her training also starts taking a drug that inhibits PGC-1? activity, will likely...
A.
experience a dramatic shift of slow twitch fibers to fast twitch fibers.
B.
compromise improvements in maximal oxygen uptake.
C.
compromise improvements in fat oxidation.
D.
optimize the decrease of the oxygen deficit at the onset of exercise by taking the drug.
E.
Only B and C are correct.
Question 38
Which of the following statements is NOT TRUE regarding the oxygen-hemoglobin dissociation curve?
The curve shifts to the right during exercise due to a decrease in pH.
The curve shifts to the right during exercise due to an increase in temperature.
The curve shifts to the left during exercise at altitude.
The steep portion of the curve represents a condition where small decreases in PO2 result in rapid offloading of O2 from hemoglobin, which occurs at the tissues.
The curve for oxygen-myoglobin dissociation looks different from this curve, because myoglobin’s affinity for O2 is greater than hemoglobin.
Question 31
Improvements in VO2max within the first week of training can be mostly attributed to an increase in...
A.
a-v O2 difference.
B.
mitochondrial density.
C.
heart rate.
D.
plasma volume.
Question 29
Which is true concerning the partial pressure for oxygen (PO2)?
A.
Is highest in systemic arteries
B.
Is reduced by half in the heart
C.
Is lowest in the lungs after inspiration
D.
Is lowest in the tissues
E.
None of the above are true
Question 30
Which of the following is not a reason stroke volume increases with acute exercise or exercise training?
A.
Increase preload (EDV)
B.
Increase plasma volume
C.
Increase venous return
D.
Increase muscle blood flow
E.
Increase afterload or peripheral resistance
A.
experience a dramatic shift of slow twitch fibers to fast twitch fibers.
B.
compromise improvements in maximal oxygen uptake.
C.
compromise improvements in fat oxidation.
D.
optimize the decrease of the oxygen deficit at the onset of exercise by taking the drug.
E.
Only B and C are correct.
Explanation / Answer
41. E). Only B and C are correct
38. The curve shifts to the left during exercise at altitude is not true.
31. C. Heart rate.
29.D is true.Partial pressure is lowest in tissues.
30. Increase afterload is not true.
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