Flashcards in Respiratory system Deck (4)
Path of Air
Nasal Cavity or Mouth
Bronchi into bronchioles into Alveoli
Very thin walls
Rich blood supply
Huge surface area
Blood has high conc. of CO2 and alveoli have low conc of CO2 high Conc of O2. Simple diffusion occurs
Thoracic cavity expands - contraction of intercostal muscles. Diaphragm contracts.
Volume of lungs increase.
Air pressure in lungs decreases so air rushes into to fill the lungs