HUMAN PHYSIOLOGY
BREATHING AND RESPIRATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Partial pressure is the average pressure it exerts on the surrounding cell or capilary
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Partial pressure is the concentration of a certain molecule or substance
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The air pressure of the gas in the lungs
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The air pressure needed to undergo diffusion through membranes
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Detailed explanation-1: -In the presence of an excess of CO2, there will be a shift to carbonic acid, ultimately causing the generation of hydrogen cations and bicarbonate anions. It is with this increased production of hydrogen ions that bodily pH will begin to decrease, causing acidosis from acidemia.
Detailed explanation-2: -The partial pressure of carbon dioxide in the blood of the capillary is about 45 mm Hg, whereas its partial pressure in the alveoli is about 40 mm Hg. However, the solubility of carbon dioxide is much greater than that of oxygen-by a factor of about 20-in both blood and alveolar fluids.
Detailed explanation-3: -The partial pressure of carbon dioxide in the capillaries is much higher than that in the alveoli. This means that net diffusion occurs into the alveoli from capillaries. The carbon dioxide is then exhaled as the partial pressure in the alveoli is higher than the partial pressure in the external environment.
Detailed explanation-4: -At the tissue site, where partial pressure of CO2 is high due to catabolism, CO2 diffuses into blood (RBCsand plasma) and forms HCO−3 and H+. At the alveolar site where pCO2 is low, the reaction proceeds in the opposite direction leading to the formation of CO2 and H2O.