What is the Role of the hemoglobin in Gas Exchange?
Hemoglobin is a macromolecule, in this case: a proteic tetramere. This means you have four (tetra) polipetidic chains (proteins). These four chains join together forming a big molecule (macromolecule) called hemoglobin. Hemoglobin is located in large concentrations in the blood. The importance of this molecule resides in the fact that it can bind temporarily to different types of molecules important in cellular respiration. Mainly we speak of protons, carbon dioxide and oxygen. Oxygen is essential for cellular respiration. Now, our cells are deep within our bodies, we don’t have them out there on the skin (not all of them, anyways). So how do our muscles receive their nourishment of oxygen? Through inspiration/expiration cycles (breathing) and circulation. As we breathe in, oxygen (due to pressure/concentration difference) goes into blood capillaries that surround alveoli (capillaries are tiny blood vessels -TUBES- and alveoli are tiny air sacs in the lungs). As oxygen enters these cap
