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Hemoglobin’s purpose is to carry important biological molecules like oxygen and carbon dioxide. Myoglobin’s purpose is to store oxygen within itself. Myoglobin’s stored oxygen are often times used by the muscles when there is a huge need of the oxygen upon physical activities to create energy.
Both hemoglobins and myoglobins are hemeproteins. However, hemoglobins are found in red blood cells and diffuses oxygen throughout the body. This oxygen goes through the blood and tissues of the body. Myoglobins are found in muscle cells, and they store oxygen in the muscle cells.
Just to add on, although both transport oxygen, hemoglobin can bind to more oxygen molecules at a time. I believe hemoglobin can bind to 4 oxygen molecules while myoglobin can only bind to 1 oxygen molecule at a time.
The biological importance is that it binds to an oxygen ligand, specifically through five bonding points (4 nitrogen atoms binding points that also connect to a central iron atom and one histidine binding site which also is through another nitrogen atom) in this way a red blood cell can deliver oxygen to parts in the body that need it. It also acts as a storage mechanism for the body.
Hemoglobin is used in our blood to transfer oxygen and myoglobin is used in our muscles to transfer o2 too. Hence, both are made of the same structure the heme structure with the same protein and 02 Hence, one is just more complex than the other. For example, the hemoglobin is 4 myoglobin which comments on their ability to transfer o2 and their ability to have the same function.
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