Gas Exchange - Gas Exchange(Respiration A Respiration 1...

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Gas Exchange (Respiration) A. Respiration 1. Cellular respiration- oxidation of glucose, Glucose + O 2 → CO 2 + ATP 2. Internal respiration- “tissue respiration,” exchange of gas between blood and tissue 3. External respiration- “pulmonary respiration,” exchange between lungs and blood 4. Ventilation- act of moving water or air over respiratory surface, “breathing” 5. Respiratory surface a. surface - some entire surfaces of organisms act as respiratory i. unicellular organisms ii. Amphibians- frogs iii. Annelids- earth worms iv. Mollusks- nudibranchs (sea slugs) b. trachea - spiracle- pore - trachea- tub, dry - tracheals- moist, fluid filled (for gas exchange) c. gills
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- Aquatic - out growths - very large network of capillaries, highly vascularized - blood flows in counter current (deoxygenated blood to oxygenated) i. maximizes extraction of O 2 d. lungs - Terrestrial - moist on inside 6. Respiratory Pigment a. hemoglobin- needs Fe to carry O 2 b. hemocyanin- uses copper, Mollusks B. Mammalian Respiratory System 1. Prelarynx portion a. nostrils- opening
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