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…showed last 75 words of 4779 total…blood cells carry oxygen from the air in our lungs to all the parts of our body. Basically, without it we would be dead. The structure of hemoglobin is important for it to function the way it does and a slight change in its structure could cause many problems such as sickle cell disease. As you can see, hemoglobin is a necessary and vital molecule that every human must have in his or her body.