Pulmonary Ventilation Flashcards
Lungs are located in the ______ ____. Each lung is associated with a single continuous membrane called ______.
thoracic cavity
pleura
Surface of lung:
Inner surface of rib cage:
Space between these two:
visceral pleura
parietal pleura
plural cavity
The pleural membrane is an example of a ______ membrane.
serous
What is a serous membrane?
a fluid-producing membrane
What is the purpose of plural fluid?
Prevents friction in the lungs and Mechanical Coupling- visceral and parietal pleura to stick together so the lungs expand for inhalation
What is elastic recoil?
when exhaling, thoracic cavity becomes smaller and elastic recoil helps shrink the lungs and push air out
What is Boyle’s Law?
If you have a given quantity of gas…
if you increase the volume (pleural cavity expands), you decrease pressure (air moves in).
If you decrease the volume (pleural cavity decreases, you increase pressure (lungs breath out).
What is Intrapleural vs. intrapulmonary pressure? What is their relationship?
Intrapleural pressure: pressure in pleural cavity - usually negative (prevents lungs from collapsing- sucks lung outward)
Intrapulmonary pressure: pressure in lungs
^^ are inverse
What is atmospheric pressure?
air pressure outside of the body- 760mm Hg
If there is in increase in lungs volume, intrapulmonary pressure _______. (increases/decrease)
decreases
Expanding the lungs _______ intrapulmonary pressure, so air from the atmosphere moves into the lungs.
decreases
What type of neurons will communicate with the diaphragm to cause contraction?
Somatic motor - because you CAN have conscious control over this
Communication in the _______ brain centers via ______ motor neurons leads to contraction of the diaphragm .
respiratory
somatic
we cannot breath without what?
the diaphragm
what muscles help with contraction and relaxation expanding the volume of the thoracic cavity?
intercostal muscles
