Insulin, growth hormone, prolactin and other water-soluble.

Messenger molecule inside the cell that activates enzymesДЄnd other cellular proteins or influences gene expression. They act by binding to protein receptors on These hormones are stored in endocrine cells Molecules derived from amino acids (the building blocks

Amino acid derivatives, such as epinephrine, are water-soluble.

Nucleus, bind to specific receptors and genes and trigger

Steroid hormones are fat-soluble molecules made from cholesterol.ДЄmong these are the three major sex hormones groups: estrogens,ДЄndrogens and progesterones.

how the hormone is broken down (metabolized).

Water soluble hormones usually bind on the outside) and Inside of the target cell (fat soluble can bind both whereas if the hormone will bind to receptor sites outside or.if the hormone travels in the blood alone or attached.StructuresДictate if the hormone prefers to be surrounded by water orДЇat (water or fat soluble), which determines: Hormones are also grouped according to chemical structure. These hormones are similar to a television signal in that they are broadcast everywhere but can only be picked up and read by a cell with the right hormone receptor or antenna. Hormones released into the bloodstream from endocrine gland cells and special cells in the hypothalamus (neurosecretory cells) travel throughout the body looking for target cells. For instance, the same uterine,Д«reast and bone cells that accept estrogens, also contain progesterone,ДЄndrogen, glucocorticoid, vitamin D and vitamin A receptors. In addition, the same cell can act as a target cell for manyДifferent regulatory molecules. Receptor sites in uterine, breast and bone cells. Sex hormones, can regulate function by binding to special estrogen Other hormones are more specific, targeting Some types of hormonesД¬an bind with compatible receptors found in many different cellsДЄll over the body. These actions produce a variety of rapid responses and long-term Influencing gene expression or altering cellular protein activity. Hormone's message and carries out the instructions by either Receptors inside or on the surface of the cell and specificallyД¬hange the cell's activities. Hormones find a target cell, they bind with specific protein Or in the fluid around cells, looking for target cells. Hormones travel throughout the body, either in the blood stream Of biological processes including muscle growth, heart rate, Humans have about 50 different known hormones, which vary in

Hormones are molecules that carry instructions from more thanДЄ dozen endocrine glands and tissues to cells all over the body.

What is hormones