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Q: 2 Review Questions pg 987

Compare ventilation in a sponge with ventilation in a human.

Ventilation itself is an organism that actively moves air or water over their respiratory surfaces. Sponges do this by setting up a current of water through the channels of their bodies by flagella. Humans and most other terrestrial vertebrates have lungs to breathe in air. Respiratory surfaces must be moist in order to function, which is constant in aquatic organisms, so they don't need adaptations like terrestrial animals to keep the lungs, tracheal tubes, etc., from drying out. The air we breathe goes deep within our bodies (unlike the exposed gills of fish), and is heated up as it passes the airways, absorbing any moisture from the air. Gas exchange of aquatic organisms is still a lot tougher because there's less of a concentration of oxygen in water, and it diffuses much slower. All respiratory systems have thin membranes with many blood vessels for quick diffusion of oxygen. Simply stated, sponges take in oxygen via gas exchange externally from their bodies, and humans have a set of lungs for which to take in oxygen

B-Wel : Very intelligently executed Miss Maxwell, love the end summarization sentence, straight and to the point with background and evidence in the previous paragraph to provide additional information! =D I do believe we should take a field trip to go snorkling to further demonstrate our respiratory differences! We could record their cycles and actions and also use our breathing from gas tanks as further comparative material. How we all breath in different environments!