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21 Cards in this Set
- Front
- Back
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what are the muscles of forced exhalation?
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intercostals
abdominal muscles |
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what innervates the diaphragm?
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phrenic
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upon contraction of the respiratory muscles, how much does intrathoroacic pressure change? Intra plural pressure?
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decreases by 1 mmHg
decreases by 2 mmHg |
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how do you find the transmural P?
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alveolar P - intraplural P
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how do you determine lung compliance?
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V/P
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what happens to the compliance of a lung if you increase the amount of elastic tissue?
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decreased
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if the lungs are highly complient, is it easier or harder to expand?
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easier
less elastic tissue |
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what is hysteresis?
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the difference in V/P slopes between inhalation and exhalation
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why do the lungs collapse during a pneumothorax?
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because the intraplural pressure equalizes with the outside pressure
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what happens to lung compliance in emphysema patients?
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it increases
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what happens to elastic recoil in emphysema patients?
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it decreases
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what happens to compliance in fibrotic patients?
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it decreases
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which disease state requires a greater pressure difference to inflate the lungs?
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fibrotic
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what factors decrease lung compliance?
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fibrosis
high lung volumes edema pulmonary congestion decreased surfactant |
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what factors increase lung compliance?
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emphysema
age low lung volumes |
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is surface tension in alveoli a collapsing force or an expanding force?
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collapsing
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what is the law of laplace?
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P = 2T/r
P= collapsing force T= surface tension |
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what is atelectasis?
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the collapsing of alveoli
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when does surfactant production begin and when is it always present?
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24 weeks to 35 weeks
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if atelectesis is present in an infant, how can we tell?
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hypoxia
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what is the equation for flow?
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Q = P/R
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