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Blood is a body liquid in people and also various other pets that delivers needed substances such as nutrients as well as oxygen to the cells and transportations metabolic waste products away from those very same cells.In animals, it is composed of blood cells suspended in blood plasma. Plasma, which comprises 55% of blood fluid, is primarily water (92% by volume), as well as contains proteins, sugar, mineral ions, hormones, carbon dioxide (plasma being the primary medium for excretory product transport), and blood cells themselves. Albumin is the main protein in plasma, and it functions to regulate the colloidal osmotic stress of blood. The blood cells are mainly red blood cells (also called RBCs or erythrocytes), leukocyte (additionally called WBCs or leukocytes) and also platelets (additionally called thrombocytes). The most bountiful cells in vertebrate blood are red blood cells. These consist of hemoglobin, an iron-containing healthy protein, which promotes oxygen transportation b