Principles of Animal Physiology
Principles of Animal Physiology
Principles of Animal Physiology
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<strong>Principles</strong> <strong>of</strong> <strong>Animal</strong> <strong>Physiology</strong><br />
Respiratory System<br />
Air Respirers<br />
▪ Avian respiration - Gas exchange surface<br />
▸ Capillaries smaller than mammals: 3-10µm vs 35µm<br />
in mammals<br />
▸ Air capillaries are not blind-ending, but<br />
communicate with each other<br />
▸ Diameter <strong>of</strong> air capillaries do not change during the<br />
respiratory p ycycle y<br />
▸ Surfactant’s role is limited to restricting fluid<br />
movement from blood to air capillaries<br />
▸ Mean thickness <strong>of</strong> the blood-gas barrier is less in<br />
birds
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