11. During maximal large muscle exercise like running, blood flow to active musc
ID: 3523285 • Letter: 1
Question
11. During maximal large muscle exercise like running, blood flow to active muscle tissue represents as much as ____ % of total cardiac output
25
50
65
85
12. Tidal volume during exercise compared to rest
remains the same
increases
decreases
fluctuates randomly
13. Pulmonary airflow depends on
pressure differences between alveolar and abdominal air
pressure differences between ambient air and pulmonary air
the action of the trachea muscle
none of the above
14. Alveolar ventilation refers to
The total volume of air breathed per minute
The total volume of oxygen exchanged between arterial and venous blood
That portion of the VE that enters the alveoli and is involved in gaseous exchange with the blood
None of the above
15. The volume of air that remains in the lungs after a maximal voluntary expiration is
the expiratory reserve volume
the tidal volume
the residual volume
the inspiratory reserve volume
16. Norms for lung volume measurements should be
expressed relative to body density
based on age and height
based on age, sex and height
based on percent body fat
none of the above
This compound augments the blood’s oxygen carrying capacity more than 60 times that carried dissolved in plasma
anhydrase
plasma
hemoglobin
bicarbonate
18. Hemoglobin saturation changes very little until the PO2 falls below ____ mm Hg
80
60
40
20
19. The small amount of oxygen dissolved in plasma
establishes the PO2 in the blood, thus determining the oxygenation and deoxygenation of hemoglobin
increases the acidity of the blood
is a good measure of nitrogen elimination
none of the above
20. The approximate percentages of oxygen, carbon dioxide, and nitrogen in ambient air are
28, 0.03, 74
0.03, 21, 79
21, 0.03, 79
79, 0.03, 21
Explanation / Answer
11. During maximal large muscle exercise like running, blood flow to active muscle tissue represents as much as ____ % of total cardiac output
Answer: 85%
12. Tidal volume during exercise compared to rest
Answer: increases ( tidal volume is the depth of breathing. so when the rate of breathing increases. tidal volume also increases.)
13. Pulmonary airflow depends on
Answer: pressure differences between ambient air and pulmonary air
14. Alveolar ventilation refers to
Answer: That portion of the VE that enters the alveoli and is involved in the gaseous exchange with the blood.
15. The volume of air that remains in the lungs after a maximal voluntary expiration is
Answer: the residual volume
16. Norms for lung volume measurements should be
Answer: none of the above ( it is measured using spirometry analysis, which is based on the individual's breathing pattern)
17. This compound augments the blood’s oxygen-carrying capacity more than 60 times that carried
Answer: hemoglobin
18. Hemoglobin saturation changes very little until the PO2 falls below ____ mm Hg
Answer: 60mmHg
19. The small amount of oxygen dissolved in plasma
Answer: establishes the PO2 in the blood, thus determining the oxygenation and deoxygenation of hemoglobin.
20. The approximate percentages of oxygen, carbon dioxide, and nitrogen in ambient air are
Answer: 21% oxygen, 0.03% carbon dioxide and 79% nitrogen.
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