1. Genetics and physical activity level/exercise account for about 50% each in t
ID: 3516122 • Letter: 1
Question
1. Genetics and physical activity level/exercise account for about 50% each in terms of VO2max.
True
False
Question 17
(respiratory) acidosis impairs performance because
A.
It reduce the perfusion rate of O2 across the alveolar membranes
B.
None of the above
C.
Hydrogen ions increase the affinity of Ca+2 for binding sites on troponin
D.
Hydrogen ions interfere with enzyme activity
18. Which of the following is not a reason a-vO2 difference improves with exercise training?
A.
Increased capillary density
B.
Increased mitochondria number
C.
Increased muscle blood flow
D.
Increased mitochondria enzyme function
E.
Increased venous return
19. Ambient humidity has no effect on bodily heat loss
True
False
Question 21
An agent that increases alveolar number woud
A.
Increase oxygen diffusion
B.
Increase carbon dioxide diffusion
C.
All of the above
A.
It reduce the perfusion rate of O2 across the alveolar membranes
B.
None of the above
C.
Hydrogen ions increase the affinity of Ca+2 for binding sites on troponin
D.
Hydrogen ions interfere with enzyme activity
Explanation / Answer
1. False.
Genetics plays a major role in terms of VO2max.
17. B. None of the above.
Respiratory acidosis is a medical emergency condition in which the ventilation is decreased and there by hypoventialtion increases the concentration of CO2 in blood and decreases the pH of blood.
18. E. Increased venous output.
This is because of increase in cardiac output .
19. False.
When temperature in air is high, humidity in air is also high, then evaporation increases and there by body heat loss is increased.
21. B. Increase carbondioxide diffusion.
It increases by increasing alveolar concentration.
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