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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.
an organ system that passes nutrients, gases, hormones, blood cells, etc. to and from cells in...
in plants: the female reproductive organ of the flower where the ovules are formed.
the transfer of pollen from the anther to the stigma of the same plant (self-pollination) or of...
molecules made of a phosphate head and a lipid (fat) tail.
neurons that have more than two outgrowths from the cell body.