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Blood is a specialized bodily fluid (technically a tissue) that is composed
of a liquid called blood plasma and blood cells suspended within the plasma. The
blood cells present in blood are red blood cells (also called RBCs or
erythrocytes), white blood cells (including both leukocytes and lymphocytes) and
platelets (also called thrombocytes). Plasma is predominantly water containing
dissolved proteins, salts and many other substances; and makes up about 55% of
blood by volume. Mammals have red blood, which is bright red when oxygenated,
due to hemoglobin. Some animals, such as the horseshoe crab use hemocyanin to
carry oxygen, instead of hemoglobin. Blood if of special interest to vampires. :)
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