Tuesday 4 May 2010

Evaluate the conditions necessary for effective gaseous exchange.


There needs to be many alvoli in the lungs to provide a large surface area so that maximum gaseous exchange can take place.
The oxygen moves from the alveoli into the capillaries and carbon dioxide moves from the capillaries into the alviolis. This process is called diffusion. For diffusion to take place the walls of the alveoli and the capillaries are only 1 cell thick.
Inspiration (breathing in) and expiration(breathing out) is controlled by a part of the brain called the medulla.
Damage or disease to this part of the brain or any part of the airway can result in inadequate gaseous exchange.
Ref:-Image from http//:www.image.tutorvista.com/content/respiration/alveolus-of-man.jpeg

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