Lab-Respiratory Function Flashcards
relationship pressure and volume
inversely related
what does increase in thoracic volume cause?
inspiration
what does decrease in thoracic volume cause?
expiration
which way does air move when pressure increases in the lungs
out of the lungs
which way does air move when pressure decreases in the lungs
into the lungs
what muscles are needed for normal inspiration?
diaphragm, intercostals
what muscles are needed for forced inspiration?
pectoralis minor, scalenes, stemocleid mastoid muscles
what muscles are needed for normal expiration?
none!
what muscles are needed for forced expiration?
contraction of intercostal and abdominal muscles
why don’t we need muscles for normal expiration?
it’s a passive process
how do you calculate tidal ventilation?
(ml)(breaths/min.)
how do you calculate alveolar ventilation?
(TV-DV)(RR)
what effect does exercise have on tidal ventilation?
increased both TV and respiratory rate
what information do you get from the FEV/FVC ratio? what does a low ratio indicate?
-how much air is being released over time
-something is wrong because you are not expelling air quickly
