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The Respiratory System

The Respiratory System. By: Mitchell Gwynn. Terms. Alveoli – provide surface area for gas exchange in mammals Diaphragm – muscle that draws air to lungs Air sacs – pockets that hold extra air in birds . Fish. Fish breathe through their gills Water comes in mouth, passes

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The Respiratory System

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  1. The Respiratory System By: Mitchell Gwynn

  2. Terms • Alveoli – provide surface area for gas exchange in mammals • Diaphragm – muscle that draws air to lungs • Air sacs – pockets that hold extra air in birds

  3. Fish • Fish breathe through their gills • Water comes in mouth, passes over gills, and out through operculum. • Oxygen enters their bloodstream through diffusion. • Some fish can breathe air through a simple lung which diffuses in the blood.

  4. Amphibians • In aquatic stage, they breathe through gills • As adults, they breathe through lungs, skin or both. • Some have a primitive lung structure and must rely on diffusion of oxygen through skin. They must stay moist. • Some have more efficient lungs and don’t rely on breathing through their skin.

  5. Reptilia • Breathe through lungs that are more developed than an amphibian.

  6. Aves • Also have lungs. • Connected to their lungs are air sacs. When a bird inhales the air goes to the lungs and rear air sacs. • When a bird exhales, the air in the lungs moves to the front air sacs and the air from the rear sacs move into the lungs.

  7. Mammalia • Have lungs with alveoli which increase surface area for gas exchange. • Also have a diaphragm.

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