Blood

Blood is the bodily fluid that delivers nutrients and respiratory gases to the body's cells and removes waste products. Blood transfusions can only be undertaken between individuals with the same blood composition.
Many humanoid species, such as humans, Bajorans, Ferengi and Klingons, had a iron-based blood chemistry which made their blood red in colour. Other species had different blood chemistry resulting in different colours for their blood, such as the Vulcans who had copper-based blood which appeared green.
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Category:Anatomy