L17_respiration_circulation_F09

L17_respiration_circulation_F09 - 1 EEMB 106 RESPIRATION...

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1 EEMB 106 RESPIRATION AND CIRCULATION I. Problems of breathing in water II. Processes involved: a. capture by diffusion (gills) b. uptake by respiratory pigment Hb Hb O 2 c. transport to tissues (circulation) d. unloading of O 2 from pigment e. movement into tissues by diffusion _______________________________________________________________________ Challenge is to extract O 2 from water and distribute it to the cells in the body, fast enough to meet metabolic demands and prevent lactic acid buildup I. No easy task: 1. Concentration [O 2 ] air = approx. 21% by volume [O 2 ] water <1% by volume 2 . Density and viscosity H 2 O 800x more dense than air H 2 O 50x more viscous So, more energy required just to move water across respiratory surfaces; fish uses 10% of the O 2 it gets from water just to keep breathing muscles going 3. Solubility - solubility decreases as temperature increases - solubility decreases as salt/solutes increases So, warm water has less O 2 than cold water and salt water has less O 2 than freshwater II. Gill structure and Gas Exchange (water blood) Evolutionary trends: Agnatha : - intake through the nostril (hagfishes) - ventilation: pump is called the velum - 1 - 16 gill sacs with counter-current structure When hagfish head is in prey, water comes in and out through gill opening behind last gill pouch
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This note was uploaded on 01/10/2012 for the course EEMB 106 taught by Professor Staff during the Spring '08 term at UCSB.

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L17_respiration_circulation_F09 - 1 EEMB 106 RESPIRATION...

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