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img026 - G0 to the next screen All venous blood returns to...

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Unformatted text preview: G0 to the next screen: All venous blood returns to the right atrium and mixes together before being pumped by the right ventricle into the pulmonary artery. The blood in the pulmonary artery is called mixed venous blood and is typically PO2 = 40 mm Hg and PC02= 46 mmHg at rest PIN“ Mr. aim *Bloodtrmlsomyarbflirdhmota W aumwmhnbnummm 0 WWW * momma-tum“ Dillullon MMMManm-lymmdbyflm on—h—y factors: :2:- l * mmwrcozovmmam 2:, fi' * vumurmmmmq-mmmmm ohm-H um ”I. ’g * Hummmmmomm m * mmmmmm mmmum-hmva-Lw 11“,” M rung-7.7 END G0 to the next screen: Here’s a summary of what we have just discussed. G0 to the next screen: Alveolar P02 and PC02 determine systemic arterial P02 and PCOZ. Alveolar P02 and PCO2 are normally determined by three factorsthkthe P02 and PCOZ of inspired an}; minute alveolar ventilation (the volume of fresh air reaching the alveoli each minute); 3) the rates at which respiring tissues consume oxygeri’ifid produce carbon dioxide. Under normal conditions alveolar ventilation matches demands of the tissues. If oxygen consumption inc ' tilation will increase. The appropriate increase in alveolar ventilation is mlled hyperpneal l 'l . l l 'l . . that 400mm Hg and P02 increases to greater than 100 mmHg. Click the Home Menu Button mm: Huuoflohin Wmlmmflmamtm W *m Awmmmmxw can * , nxyhemoalobm OII—d-I- Doom-n *‘n- , urn-mot ‘- m ‘ histamine-1W (w *W’OIWI-deolm rum-ca; *La-Pozflnlllllusr-lcmoloxywl 6 Click to Oxygen Transport Button: We have just discussed the exchange between air and blood and between blood and tissue. Now we will look at how gas is transported within the blood. What happens to the oxygen that enters the blood? Most oxygen binds to hemoglobin in the RBC although somegoxygen is Wma Hemoglofiii has a unique structure that allows oxygen reversibly bind to it. Hemoglobin consists of four subunits, each of which contains a globin and a heme group that contains iron. The heme groups are each capable of binding one oxygen molecule, so each hemoglobin molecule am carry four oxygen molecules. In the lung: oxygen molecules move from alveolar air to capillary blood, and bind to hemoglobin; when blood reaches respiring tissues, oxygen molecules dissociate from the hemoglobin and diffuse to the cells. Oxygen binds reversibly with hemoglobin. High P02 facilitates the binding of oxygen with hemoglobin, whereas low P02 facilitates release of oxygen from hemoglobin. pant: 1 n?‘ ...
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