Editing Blood And Buffers (section)

===Short Explanation===
''Buffer Solutions'' are able to resist a change in the pH, or acidity, which keeps the solution from becoming too acidic or basic. Our blood cells work to keep the blood in a stable pH range between 6.8 and 7.4, which is very narrow. One reason why our blood does this is because our bodies get energy from sugars and oxygen. When sugar reacts with oxygen, it breaks down into carbon dioxide (CO<sub>2</sub>) and water. CO<sub>2</sub> can react with water to make carbonic acid, which would make our blood more acidic, lowering the pH. We see this happen with the dry ice in the beaker with water, and how the indicator changes to yellow because of the acidity. Our blood prevents this by slowly reacting with the carbonic acid as it forms, and breaking it back down into CO<sub>2</sub> and water so that our lungs can breathe it out. Another reason why our blood has these buffering agents is because the carbonic acid can break down into bicarbonate. Bicarbonate can make the blood more basic, which increases the pH. We see this happen with the calcium carbonate in the beaker with water, and how the indicator turns blue because of it. Our blood prevents this by latching onto the extra bicarbonate so it doesn't react, and helping our kidneys filter it out.