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h99h20baby
Joined: 01 Jul 2007
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 Posted: Tue Jul 24, 2007 10:34 am Post subject: Question 27 |
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| When you inhale your external intercostals contract and the thoracic cavity fill with air, creating larger volume and thus lower intrapleural pressure correct? this is what negative pressure means right? according to Boyle's Law increase volume = decreased pressure. why the increase in the transpulmonary pressure then? |
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admin
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| Posted: Wed Jul 25, 2007 10:48 pm Post subject: |
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| Quote: | | When you inhale your external intercostals contract and the thoracic cavity fill with air, creating larger volume and thus lower intrapleural pressure correct? |
"Intrathoracic" not "intrapleural."
Knowing basic information is important for the MCAT but you must be flexible so that when new information is presented, you can still evaluate it. For example, you were not expected to know what "transpulmonary pressure" means so that is why it is defined in the passage. It seems that you interpreted it to mean "intrathoracic pressure" but it does not.
"Transpulmonary pressure is a physical factor which exerts a distending force on the airways and alveoli. Such a force is critical to prevent small airways from collapsing."
Certainly, if you are trying to breathe (inspiration) then you want your airways to open (increase transpulmonary pressure; not the same as intrathoracic pressure). |
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admin
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| Posted: Thu Jul 30, 2009 3:09 pm Post subject: |
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