11. Cardiopulmonary Anatomy and Physiology_edBT

11. Cardiopulmonary Anatomy and Physiology_edBT - Exercises...

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Unformatted text preview: Exercises 11 Gas Exchange In Small Organisms Many small aquatic organisms achieve gas exchange through diffusion Movement allows enough contact with oxygenated water for gas exchange Often these organisms are sluggish What if you have higher energy demands? Gas Exchange In Larger Organisms More complex methods are necessary for gas exchange: Spiracle/Trachea Skin Gills Lungs Gas Exchange In Larger Organisms More complex methods are necessary for gas exchange: Spiracle/Trachea Skin Gills Lungs How did these modes of respiration evolve? Lungfish outpocketing of pharynx Gas exchange and swim bladder Modern bony fish Lost connection to pharynx, just swim bladder Gills Amphibians, Reptiles and Mammals Increased surface area through folding-lungs Skin Specialized bird lungs Birds, way cool respiration ! Air Flow 1) Trachea Rear air sacs 2) Lungs 3) Front air sacs 4) Trachea Leaves body One way air flow allows continuous movement of air why important? Human Respiration Mammals breath air through their lungs Air higher concentration of oxygen faster diffusion less work Must be kept moist for gas exchange Human Respiration Air Flow Humans Nostril Pharynx Larynx Trachea Bronchi Lung Bronchioles Alveoli Human Respiration Alveoli Blind Sacs One Cell Thick Covered by capillaries Where gas exchange occurs Tracheotomy Fish Circulation...
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This note was uploaded on 10/20/2009 for the course BIOL 112 taught by Professor Vaughn during the Spring '08 term at Texas A&M.

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11. Cardiopulmonary Anatomy and Physiology_edBT - Exercises...

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