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Blood consists of many elements, liquid and solid. These include red and white blood cells, blood platelets, and blood plasma. The plasma is the liquid part of the blood, something over 90% water. In it are dissolved essential elements that have to be carried from one place to another. These include, for example, organic constituents, such as blood sugar (glucose) and urea; inorganic elements, such as sodium and calcium; gases, such as oxygen and carbon dioxide; and secretions from the endocrine glands (hormones), antibodies, enzymes, and plasma proteins.
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