Bio February 22

Bio February 22 - Bio February 22 Wednesday Lecture Birds...

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Bio February 22 Wednesday Lecture Birds Posterior air sac fills up Exhalation – air moves to lungs Moves to anterior air sac then passes out Question: Which of the following is NOT a difference between birds and mammals? - Bird lungs = more efficient - Bird lungs use a continuous flow system - Mammalian lungs made up of alveoli - Mammalian lungs contain anterior and posterior sacs* Lower pH = higher CO2 (increase breathing rate) In mammals, the amount of O2 carried in blood is increased 70x by hemoglobin binding It is the iron that reacts with the oxygen – carbon monoxide Hemoglobin - How obtain and deliver oxygen? - Must bind oxygen reversibly! - If CO2 gets high and changes blood pH, then hemoglobin gives up oxygen o Loading at lungs o Uploading to active tissues Weddell Seal - Don’t depend on lungs to store gasses; depend on blood - Slow down metabolism - Run muscles off of anaerobic respiration Decompression sickness - “The Bends” - Bubbles form inside your blood stream; accumulate in joints
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This note was uploaded on 02/27/2008 for the course EBIO 1220 taught by Professor Demig-addams during the Spring '07 term at Colorado.

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Bio February 22 - Bio February 22 Wednesday Lecture Birds...

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