Lecture 1 - Respiration Flashcards
Gas travels from an area of ___ concentration to an area of ___ concentration.
high; low
Pressure outside the body (atmospheric pressure) and pressure inside the lungs (alveolar pressure) are ___
equal
For the lungs to inflate, alveolar pressure must be ___ than atmospheric pressure
less
pressure and volume are ___ proportional to one another
inversely;
ex.) when we inhale, pressure decreases and volume increases
For air to flow out of the lungs, alveolar pressure must be ___ than atmospheric pressure.
greater
What nerve are motor impulses sent through to the diaphragm?
phrenic nerve
Oxygen travels from an area of ___ pressure to an area of ___ pressure.
high; low
what happens to the diaphragm when it contracts?
moves downward
when the diaphragm contracts, lung volume ____ and alveolar pressure ____
increases; decreases
when inspiration terminates, what forces (passive or active) return the diaphragm to its resting position & ribcage falls?
passive elastic recoil forces
what are the two primary muscles for inspiration?
diaphragm
external intercostal muscles
during vocalization, are muscles of inspiration and expiration using active or passive forces?
active
Contracting which two muscles makes expiration an active rather than a passive force?
Internal intercostal muscles
abdominal muscles
Quiet breathing is ___% inhalation and ___% exhalation
40% inhalation, 60% exhalation
Breathing for speech is ___% inhalation and ___% exhalation
10% inhalation, 90% exhalation
