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
