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Hormones are biological chemicals that are found in plants and animals. Hormones are produced by living cells.

They are used to send messages to other cells. These messages can be sent to nearby cells or to far-away cells. If a cell wants to send a message to a nearby cell, it puts the hormone into the tissue around it. If an animal's cell a message to a far-away cell, it puts the hormone into the blood. When a hormone is put in the blood it goes to all parts of the animal's body. Sometimes the cell that gets the message can even be the same cell that made the hormone (and sent the message.)

The cell or tissue that gets the message is called the target cell.

Many different kinds of cells can send a message. There are some kinds of cells whose main job is to make hormones. When many of these cells are together in one place, it is called a gland. Glands are groups of cells that make something and release it (put it outside the cell). Some glands make hormones.

Endocrine means something that is made by cells and released into the blood or tissue. So endocrine glands form hormones and release them into the blood or tissue. The opposite word is exocrine and means released outside of the body. An example of exocrine is sweat glands or saliva glands. When people say endocrine they usually mean glands that make hormones.

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