Lecture6 - Lecture#6 C snakes 1 primitive snakes o Paired...

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Lecture #6 08/07/2008 15:33:00 C. snakes 1. primitive snakes o Paired lungs 2. advanced snakes (venomous) o Left lung is reduced (figure 1) * reptiles have a  triphasic respiratory cycle inspiration   breath hold (apnea)   expiration (passive) V. Comparisons A. respiratory efficiency (figure 11.38 last weeks handout) most efficient-----------------------------  least efficient * counter current (fish) > cross current (birds) > pool/open (mammals)  (80% O2 extraction)          (40% extract.)            (25% extract.) VI. Oxygen delivery (figure 2) ~ventiliation  partial pressure of O2 in alveoli >100 mmHg (lung  blood   tissue)------  all dictated by the rate of O2 disappearance in the mitochondria
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*O2 delivery has to be matched at each stage (figure 3) circulatory system= means to transport substances (blood gases/ nutrients/rid waste products/circulate hormones/  immune system components) around the body to all the different tissues. Components: o Blood (hemolymph) o Vessels for blood circulation Closed circulatory system = all vertebrates and some inverts (blood is always in vessels) o Pump that moves blood around = heart and/or squeezing action of body B. Gas transport 1. oxygen: poorly soluble in water (hydrophobic) 2. if had water instead of blood in arteries we would move ~3mL O2 per L of fluid o an exercising man uses ~3L of O2/min o would need to pump 1000L per min just to exercise  really pump ~5L blood/min Oxygen carriers: large proteins w/metals that interacts with O2 itself o Hemocyanin     : arthropods, mollusks – large molecular weight of 300-900,000 mw with Cu group (green/blue  color) o Hemoglobin: all vertebrates – smaller, with iron
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This note was uploaded on 07/23/2008 for the course BIO 131 taught by Professor Mostman during the Summer '08 term at UCSC.

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Lecture6 - Lecture#6 C snakes 1 primitive snakes o Paired...

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