The lungs Watch

Laurens88
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What are the two main functions of the lungs? Can anyone help pls
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macpatgh-Sheldon
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Hi Laurens88,

1. Exchange of gases between the liungs and the blood in the capillaries surrounding the alveolar walls - oxygen from alveolar cavity into blood and CO2 in opposite direction; breathing (inspiration and expiration of air) maintains concentration gradients of O2 & CO2 in appropriate directions for efficient diffusion of these gases.

2. Homeostasis: lungs have an important role in maintenance of normal pH of the blood and body fluids. CO2 has a pH lowering effect due its abilit to combine with water to form carbonic acid:

CO2 + H2O = H2CO3

By controlling the amount of CO2 breathed out (through control of breathing rate and depth) this helps maintain a steady pH (although the primary organs that maintain pH are the kidneys)

Hope this answers your Q.

Regards, Mukesh (Specialist Biology Tutor)
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Laurens88
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Thank you very much that is a lot of help.
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