Respiratory - Respiratory Gas Exchange- Respiration (NOT...

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Respiratory Gas Exchange- Respiration (NOT “cellular respiration”) Respiratory medium for land animals: air Exchange of O2 and CO2 Occurs by diffusion Respiratory surfaces are moist, thin (Simple squamous) and have  large surface areas Maximizes gas exchange Molecules move from areas of high pressure to low pressure Two aspects of pressure affect the process of respiration: o Inhalation-Exhalation: Pressure of air in lungs vs. Outside of lungs o Uptake and unloading of O2 and CO2: Partial pressure of each gas on each side of exchange  surface Lungs Size, complexity, surface area for exchange increase wth an animals  metabolic rate o High rate of gas exchange needed to keep cellular respiration  going Air is warmed and humidified as it enters the nasopharynx o Moist surface required Particles are trapped by hair and mucus- coughed up, swallowed,  handled by immune system Series of branching ducts o Trachea splits into two bronchi o Bronchi branch into bronchioles
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Respiratory - Respiratory Gas Exchange- Respiration (NOT...

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