Friday, April 23, 2004

Mammal, Respiratory system

Closely coupled with the circulatory system is the ventilatory (breathing) apparatus, the lungs and associated structures. Ventilation in mammals is unique. The lungs themselves are less efficient than those of birds, for air movement consists of an ebb and flow, rather than a one-way circuit, so a residuum of air remains that cannot be expired. Ventilation in mammals

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