Well, as we'll see in just a moment, the Held in effect actually promotes it increases the amount of carbon dioxide that can be released by the exercising tissue to the blood. And at the same time, it also increases the number of CO2 molecules that can be absorbed by the alveoli of the lungs from the blood plasma. And to see what the Halin effect is and how it achieves this, let's begin by taking a look at the following diagram. So let's suppose I'm moving my arm back and forth. And as I move my arm back and forth, the muscle tissue begins to contract and ATP molecules are being produced by those muscle cells. So this is let's suppose that muscle cell and this is the nearby capillary that carries the red blood cells.