bio - gas exchange

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  • Created by: stuDYING
  • Created on: 09-01-10 11:22

BREATHING/VENTILATION: the process of moving air in (inhalation) and out (exhalation) of the lungs.

- ventilation is made possible by action of muscles.: diaphragm & intercoastal muscles

diaphragm contracts/flattens
intercoastal muscles - contract
rib cage - moves upward & outward
volume of chest cavity - increases
pressure of == - decreases
air movement - forced inside lungs

diaphragm relaxes/becomes dome shaped
intercoastal -


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