Gas Exchange

Gas Exchange - Gas Exchange 4:07:00 PM Physiology Study of...

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Gas Exchange 11/03/2008 18:07:00 Physiology Study of the mechanical and biochemical functions of living organisms Homeostasis o Maintain stable conditions in the internal environment Extracellular fluid Makes multicellular animals possible Specialized cells o Functions External Transport of nutrients, waste Internal Circulation Energy storage Movement Information processing Oxygen content Oxygen is needed for cellular respiration o Creation of ATP Oxygen is 21% of air o Partial pressures Find total pressure and multiply by percent of desired  component 1 atm = 760 mm Hg Sea level 159 mm Hg is oxygen Decreases from air to mitochondria Solubility o Ease of dissolving gas into water Temperature o Plays a significant part o Cold holds more oxygen than warm
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Gas Transfer 11/03/2008 18:07:00 Oxygen only moves by diffusion
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Breathing Diffusion across respiratory epithelium Bulk Transport Diffusion across capillary walls Rates of diffusion Oxygen moves easily in air o Also holds more oxygen o Breathing is usually tidal in air Less so in water o Breathing typically unidirectional o Diffusion is also an option Flatworm - has no circulatory system
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This note was uploaded on 04/03/2008 for the course ECOL 182 taught by Professor Chesson during the Spring '08 term at Arizona.

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Gas Exchange - Gas Exchange 4:07:00 PM Physiology Study of...

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