How Hormones Work
A hormone acts upon a cell much like a key unlocking a door. After being released by a gland, a hormone molecule travels through the blood until it finds a cell with the right fit. The hormone latches onto a cell via the cell’s receptor. When this happens a signal is sent into the cell. These signals may instruct the cell to multiply, make proteins or enzymes, or perform other vital tasks. Some hormones can even cause a cell to release other hormones.
A hormone may fit with many types of cells but may not affect all cells in the same way. For example, one hormone may stimulate one cell to perform a task, but it might also turn off a different cell. Additionally, how a cell responds to a hormone may change throughout life
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