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a chemical messenger produced and released by a cell or a gland in one part of the body of the organism that affect cells in other parts of the organism. In essence, it is a chemical messenger that transports a signal from one cell to another. Only a small amount of hormone is required to alter cell metabolism. Hormones in animals are most often transported in the blood.
a type of nuclear division during which somatic cells divide into new cells for growth or to...
coiled nephron tubule that extends from the loop of Henlé to the collecting duct.
a microscopic hair-like extension of the cell membrane of the epithelial cells forming the outer...
bitter yellow or green alkaline fluid secreted by the liver, which serves to emulsify fats