"olive" wrote:
Which of the following factors will tend to make intrapleural pressure more negative?
a. increasing lung volume
b. increasing the secretion of pulmonary surfactant
c. increasing compliance of the lung
d. increasing cardiac output
Plz explain your answer.Thanks
:icon_scratch:
A?
Intrapleural pressure becomes more negative during inspiration...
Answer C. increasing lung compliance is something like emphysema. That would decrease recoil.
Answer B. increasing surfactant secretion would prevent lung collapse. but wouldnt make intrapleural pressure more negative.
Answer D. ??? increasing cardiac output doesnt necessarily mean increasing intrapleural pressure.
What's the correct answer?
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| IT153
Forum Newbie
Topics: 1
Posts: 29
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I think it is D
If intrapleural preassure becomes more negative - the resistance of the vessels decreases - pulmonary vessels expand and volume of blood in the pulmonary system increases. It increases the cardiac output.
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| Idiopathic
Forum Guru
Topics: 19
Posts: 641
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Intrapleural pressure becomes more negative when the chest is actively expanding. I think it has to be A.
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| asmi
Forum Hero
Topics: 1043
Posts: 4,609
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I think its A
Because inspiration( increasing lung volume) will make intraplural pressure more negative.
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| bright_nnn
Forum Senior
Topics: 17
Posts: 97
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Yeah A makes a lot more sense.
Inspiration causes the Pressure to go more negative
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