Unformatted text preview: system of insects for gas transport to and from tissues 3. Gills GILLS are an external organ and are very different from lungs due to the of nof t4., epithelium to increase SA. Site of gas exchange is the secondary lamella" n\ flfl ventilation is.tlNlglBECIloNAL due to properties of water Blood flow is COUNTERCURRENI Water and \----blood flow in opposite directions. This maintains a gradient along the gill exchange surface (secondary lamellae) and allows the almost complete transfer of 02 3. Lungs LUNGS are an organ of small volume which allows for: Q maximization of respiratory S.A. Qu"n small diffusion distance covered in rab handout. rib n"t'lo'*va J Mammals use negative-pressure breathing /P$c# 2d' f#;r air into rungs) and air no* iffi t^effiffi Automatic controlof breathing (Fig. a2.271 ;rkb*) . breathing is regulated by involuntary mechanisms \-__...
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- Fall '10
- Vertebrate trachea, Invertebrate trachea