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Flashcards in Respiratory system Deck (4)
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Path of Air

Nasal Cavity or Mouth
Pharynx (throat)
Past Larynx
Past epiglottis
Into Trachea
Bronchi into bronchioles into Alveoli

1

Alveoli

Very thin walls
Rich blood supply
Moist lining
Huge surface area

Blood has high conc. of CO2 and alveoli have low conc of CO2 high Conc of O2. Simple diffusion occurs

2

Breathing in

Inspiration
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

3

Breathing out.

Expiration.
Thoracic cavity decreases
Diaphragm relaxes
Volume of lungs decreased
Air pressure in lungs is greater then outside so air rushes out