54. In what situation would the gas exchange ratio be decreased compared to the

Question

54. In what situation would the gas exchange ratio be decreased compared to the respiratory quotient: a) ding hyperventilation (b) during slowed breathing (c) holding your breath (d) in a fasting individual (e) this is impossible. The two are always equivalent. 55. Which of the following statements about Hb is FALSE: (a)a higher P50 than normal means that the O2 binds less tightly to Hb (b) an increase in 2,3-DPG shifts the O2 uptake curve to the left c) an increase in PCO2 causes a right shift of the O2 uptake curve (d) an decrease in pH increases P50 (e an increase in temperature shifts the O2 uptake curve to the right 56. Compliance is: (a) (b) (c) (d) (e) low in obstructive lung disease low in lungs from large mammals in comparison to small mammals high in fibrotic lung disease high in the range where normal tidal breathing takes place high at high expanding pressures

Explanation / Answer

Question 54

Answer is A (during hyperventilation)

It is the ration of production of carbon dioxide to the amount of oxygen consumed. During the hyperventilation, the exchange of gas is very less or decreased due to decreased time if the interaction between tissue and blood in lungs.

Question 55

Answer B (An increase in 2,3-DPG shifts the O2 uptake curve to the left.

An increase in 2,3-DPG shifts the O2 uptake curve to the right.

Question 56

Answer is B (low in lungs from large mammals in comparison to small mammals )

Compliance is the force or effort required to stretch the lungs and the thoracic cavity.

The small mammals have more recoiling and have more lung compliance and lungs of large mammals have slow lung compliance.

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