![]() The globins are essentially describing the rest of it- the In each of those chains, you have a heme group If you imagine them, they're aīunch of molecules and amino acids and then they're curledĭescribes its shape. We're not going to go into theĭetail of that, but these look like little curly ribbons. To drop off the oxygen? So this right here, this isĪctually a picture of a hemoglobin protein. These aren't sentient beings,īut how do they know when to pick up the oxygen and when Operate- know, and I have to use know in quotes. The red blood cells, depending on what level you want to One- because it's important,īut also it explains a lot about how the hemoglobin- or I would dedicate an entire video to hemoglobin. Importance of hemoglobin in our red blood cells so I thought This last mechanism is crucial because the greatest proportion of the CO2 made in the tissues is carried to the lungs in the form of HCO3- dissolved in the plasma. The indirect loss of HCO3- occurs as previously explained, ultimately also producing H2O and CO2 which are exhaled. When H+ releases, O2 can be picked up by hemoglobin. Indirect loss of H+ coaxes any H+ bound to hemoglobin to release in order to make H2CO3, which then becomes CO2 and H2O and is also exhaled. Loss of CO2 through exhalation coaxes any CO2 bound to hemoglobin to release and be exhaled. Summarizing thus far, exhalation directly removes CO2 and H2O and this results in the indirect removal of H+ and HCO3. The resultant effect here is the indirect removal of H+ and HCO3- from the blood. The dissociation of H2CO3, in turn, reduces the H2CO3 pool and coaxes replenishment of H2CO3 by combining hydrogen ions (H+) with bicarbonate ions (HCO3-). Reference the video on Le Chatelier's principle for an explanation on why this "equilibrium shift" happens. This constant removal of CO2 and H2O coaxes carbonic acid (H2CO3) to dissociate into H2O and CO2 (catalyzed by carbonic anhydrase) in order to replenish the pool of CO2 and H2O (which are still constantly being eliminated due to exhalation). In the lungs, CO2 and H2O (water vapor) are constantly being exhaled. For a more detailed explanation, read on. When it unloads CO2 and H+, hemoglobin picks up O2. The simple answer is that hemoglobin drops off CO2 and H+ in the lungs, but this is not exactly what is exhaled.
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