A&P II Notes April 12

A&P II Notes April 12 - Anatomy Physiology II Notes...

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Anatomy & Physiology II Notes – 4/12/07 Respiratory System cont.  Carbon dioxide transport – flows away from the metabolizing tissues and is exhaled by the lungs,  transported in three different ways: o ~10% transported dissolved in plasma o ~60% as bicarbonate ion (HCO 3 - ) (CO 2  + H 2 O:  carbonic anhydrase (enzyme)   H 2 CO 3 carbonic acid   HCO 3 -  + H + ) – hydrogen ions are acidic and if all of them remained as such it  would acidify the blood (not good), so hydrogen ions bind to hemoglobin and are temporarily  eliminated – when there’s a higher hydrogen ion concentration there is less affinity for oxygen o ~39% as carbamino-hemoglobin – carbon dioxide is bound to hemoglobin Medulla is the main brain relating to respiration, also areas in the pons, hypothalamus, and cerebral  cortex that also have input into the medulla o
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