BIOL 150B Chapter Notes - Chapter 33: Hemoglobin, Epiglottis, Chlordiazepoxide
3 Apr 2016
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Use their whole body surface area for gas exchange. Capillaries are near the surface to allow exchange. Gastrovascular cavity: central cavity, that is also involved in digestion, that brings water close enough to internal cells so that diffusion can meet their needs. Very then with lots of surface area. Closely related with capillaries, receiving a high blood supply. O diffusion is aided by countercurrent exchange. O concentration that could be reached (the equal librium) Associated with most aquatic animals & some amphibians: tracheal system: internal network of branching, air- lled tubes. Complete decoupling of the circulatory & respiratory systems. Spiracles: openings along the side of the body surface in which air enters & leaves body: can control whether they are open or closed in order to prevent dehydration. Lungs are connected to in atable air sacs, which act as air reservoirs. Air moves in a single direction, not allowing fresh & spent air to mix.
