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a hormone produced by the adrenal glands which helps to maintain the balance of sodium in the blood and tissue fluid.
an atom or a group of atoms that has gained or lost one or more electrons and so has an electric...
a foreign substance, usually a protein, that stimulates the production of one or more antibodies...
an alkaline watery fluid containing digestive enzymes, which is secreted into the mouth by...
simple epithelium with flattened cells found in the inner lining of the mouth, oesophagus and...