respi Flashcards
The air you breathe is composed of ____ oxygen, ___ nitrogen, about ___ carbon dioxide, and minute proportions of other gases.
21 % oxygen
78 % nitrogen
1% carbon dioxide
is the uptake of molecular O2 from the environment and the discharge of CO2 to the environment.
Gas exchange
the process of obtaining sufficient oxygen and expelling excessive amounts of carbon dioxide
Respiration
ribs expands the volume of the thoracic cavity
inhalation
size of the thoracic
cavity reduced
exhalation
- ribs return to normal
position
exhalation
diaphragm contracts (moves down)
inhalation
diaphragm relaxes (moves up)
exhalation
rib cage gets smaller as rib muscle relax
exhalation
allowing oxygen to enter the bloodstream and carbon dioxide to exit.
alveolus gas exchange
air enters the lungs (nostril down to alveoli)
inspiration
air is expelled from lungs (alveoli up to nostril)
expiration
actual exchange of gasses
respiratory zone
conduct/ gather air from environment
conducting zone
inflammation of the bronchi
bronchitis