A hormone is a regulatory substance produced in an organism and transported in tissue fluids such as blood or sap to stimulate specific cells.
Hormones are chemical messengers that help regulate such things as growth, metabolism, hunger, sexual arousal and reproductive functioning. Essential hormones include insulin, testosterone, estrogen, human growth hormone, and epinephrine.
Hormones are chemical messengers that help regulate such things as growth, metabolism, hunger, sexual arousal and reproductive functioning. Essential hormones include insulin, testosterone, estrogen, human growth hormone, and epinephrine.