s6 - Gas Exchange Gas exchangers are areas of the surface,...

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Gas Exchange Gas exchangers are areas of the surface, or interior, of organisms that is modified to provide easy uptake of oxygen and excretion of CO 2 Important physical characteristics of a gas exchanger large surface area thin membrane to facilitate diffusion of gases moist highly vascularized and perfused these very characteristics of a gas exchanger make it vulnerable to mechanical damage and the site of potential osmoregulatory problems in aquatic animals that are not isotonic to their environment or the site of evaporative water loss in terrestrial animals thus, gills and lungs are usually internalized and/or protected--and irrigated/ventilated by special structures note the special case of insects, where the tracheal system is a gas-filled pathway leading to small groups of cells within the body of the insect—smallest tubules called tracheoles. The form and function of animal gas exchange is shaped by the viscosity/density and gas content of the respective gas exchange media--air-breathing vs. water-breathing Constraints of oxygen uptake air contains 210 ml of O 2 per liter, while water only contains 7 ml O 2 /l water, when in equilibrium with air thus, air is a good place to get O 2 from, water is not
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s6 - Gas Exchange Gas exchangers are areas of the surface,...

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