Now let's move on to the lungs. So once we're inside the lungs, this is basically what we're going to see. So we have the blood capillary, and now instead of having the exercising tissue, we have the alveolar space of the alveoli found inside the lungs. So now what happens is basically the opposite of what happens here. So now we have the reverse reaction taking place. So we have about 85% of the carbon dioxide molecules existing in the bicarbonate ion form.