Blood appears red. This color is due to the large number of red blood cells it contains, which get their vibrant hue from hemoglobin.
Here's a breakdown:
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Red Color: The iron-containing protein hemoglobin within red blood cells is responsible for blood's characteristic red color.
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Hematocrit: The percentage of your blood's volume that is made up of red blood cells is called the hematocrit. It's a common way to measure red blood cell levels.
In summary, blood is visibly red because of the presence of hemoglobin in the numerous red blood cells it contains, and the concentration of these cells is measured by the hematocrit.
