Respiratory physiology Flashcards
Diaphgram innervation, movement with contraction and what does that do to volume?
phrenic nerve, with contract it flattens and moves towards abdomen which increases volume
external intercostal muscle increases which diameter?
anteroposterior diameter of thorax (bucket handle motion)
What does scalene muscle do?
raise 1st and 2nd rib
what does sternomastoid do?
raise sternum
Are the lung and ribs physically connect to eachother?
NO
at rest what is intrapleural pressure
-5 cm H20
As thorax increases in volume, intrapleural pressure will _____ to what what pressure?
Decrease, -8 cm H20
As lungs increase in size, the alveolar pressure will ___
decrease
Alveolar pressure at rest and inspiration?
0 cm H20 and -1 Cm h20(due to inc in alveolar size)
tidal volume definition and size
amount o fair inhaled in a given breath, 500 mL
internal intercostals do what
decrease AP diamter of thorax
intrapleural pressure more/less negative with inspiration
more
alveolar pressure more/less negative with inspiration
more
intrapleural pressure peak negative value at ___
end-inspiration
alveolar pressure peak negative value at __
mid-inspiration
Does intrapleural always remain negative
yes
does alveolar pressure always remain negative
No, becomes positive in expiration
When does intrapleural pressure reach peak value?
end-expiration
When does alveolar pressure reach peak positive value?
mid-expiration
calculate minute ventilation
V(dot)=Vt * frequency
define anatomic dead space
dead space b/c blood cant get oxygen there, anatomic b/c they weren’t designed to exchange oxygen
formula for anatomic dead space
pt weight and change lbs for mL
Minute alveolar ventilation formula
V(dot) alv= V(alv)*frequency
alveolar ventilation formula
V(alv)= V(tidal)-V(dead space)
define anatomic dead space
volume of air that remains in conducting airways
define tidal volume
how much air you take in during inspiration
