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The Respiratory System

This overview of the respiratory system delves into how various animal groups—mammals, birds, fish, amphibians, and reptiles—adapt their breathing mechanisms for survival. Key components like alveoli in mammals, gills in fish, and air sacs in birds are examined. The diaphragm's role in mammals and the unique respiratory adaptations of amphibians are highlighted. This comprehensive look at evolutionary respiratory strategies reveals the intricate ways in which different species exchange gases and maintain homeostasis in diverse environments.

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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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