BIO 102 Lecture 22: Chapter 33 Notes

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15 Feb 2017
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Respiratory surfaces are very thin to minimize diffusion distances, respiratory surfaces have sufficiently large surface area in contact with the. Respiration: the process by which organisms exchange gases with the environment, taking in oxygen and releasing carbon dioxide, in support of cellular respiration. Bulk flow: the continuous supply of oxygen and removal of carbon dioxide. Called bulk flow because the masses of molecules that form the flowing substances, such as air and water, move together (in bulk) through relatively large spaces. Gastrovascular cavity: brings water close enough to the internal cells that diffusion meets their needs for gas exchange. (used by cnidarians) Respiratory systems: consist of respiratory organs that work as a unit to facilitate gas exchange between the animal and its environment, carry gases close to body cells. Countercurrent exchange: the way fish facilitate gas exchange with water. Within the gill, water and blood flow in opposite directions, maintaining a concentration gradient through the entire gill.

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