Lecture GasExchange 1

Lecture GasExchange 1 - STORAGE oxygen consumption cellular...

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STORAGE
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oxygen consumption cellular respiration Read Chapter 9 steady state
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Respiratory Gas Exchange Respiratory Gas Exchange Aerobic Aerobic : Animal requires molecular oxygen for oxidation of energy substrates •requires ±O 2 uptake + transport to sites of utilization; reciprocal transport of CO 2 diffusion : important physical process, but s .l. .o…w…. . problem of size : Uptake area Diffusion distance
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Shape is important! Strictly diffusional gas exchange: Size & Shape • protozoans • sponges • cnidarians •some ±worms • larval stages of some invertebrates Theoretical size limit for diffusive exchange ~ 1 mm diam.
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Gas Exchange: 4 Linked Processes In Multicellular Animal Ambient medium Gas exchanger Blood circulation Tissues (mitochondria) Diffusion Convection O 2
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Why is mammalian tissue Why is mammalian tissue red? red? source sink
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Oxygen demand Oxygen demand • Size • Metabolic Rate • Activity • Temperature
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Water Problems of Gas Exchange are Different Problems of Gas Exchange are Different Air
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Water Breathers Air Breathers Bimodal Breathers [Air or Water] Lungfish
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Air vs.
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Lecture GasExchange 1 - STORAGE oxygen consumption cellular...

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