PCO2 is 55 mmHg in the cells and PCO2 is 48 mmHg in the interstitial fluid. Will CO2 flow from cells to fluid or from fluid to cells? Why? PCO2 is 45 mmHg in the capillaries and PO2 is 40 mmHg in the alveoli of the lungs. Which direction across the respiratory membrane will CO2 flow? Why?
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- The PCO2 in the cells is 55 mmHg. - The PCO2 in the interstitial fluid is 48 mmHg. - CO2 will flow from areas of higher concentration to areas of lower concentration. Show more…
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Which of the following statements is true regarding partial pressure and the diffusion of gases in the body? In internal respiration, the PCO2 in the systemic capillary is 40, while the PCO2 in the interstitial fluid is 45. Internal respiration involves the diffusion of oxygen from the alveolus into the pulmonary capillary. The partial pressure of oxygen in the systemic capillary is 40 mm of Hg before it moves into the interstitial fluid. If the partial pressure of oxygen in the interstitial fluid is lower than the partial pressure of carbon dioxide in the interstitial fluid, carbon dioxide will not diffuse from the interstitial fluid into the systemic circulation. The partial pressure of oxygen in the pulmonary circulation as it returns to the heart is 95 mm of Hg.
Madhur L.
Concentrations of oxygen and carbon dioxide in the air and in the body are measured as "partial pressure", which is written as pO2 and pCO2. The units to measure partial pressure are "mmHg" which is pronounced "millimeters of mercury", a standard unit for measuring the pressure of gases. Below is a data table showing the pO2 and pCO2 in the lungs and in the blood. Air inhaled into lungs: 150 mmHg pO2, 0 mmHg pCO2 Blood flowing into lungs: 100 mmHg pO2, 40 mmHg pCO2 Knowing that oxygen and carbon dioxide always move by simple diffusion: (a) Which way will oxygen move? (from the lungs into the blood / from the blood into the lungs / both ways equally)? (b) Which way will carbon dioxide move? (c) Explain why you answered (a) and (b) the way you did.
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