Hormone act only on specific cell types in an organism and not others because it binds with a specific hormone receptor in a targeted cell.
To activate particular cells or tissues, a regulatory chemical is created in an organism and transferred in tissue fluids like blood or sap is known as hormone.
Basic example of hormone is Testosterone, Oxytocin, Adrenaline, Glucagon, etc.
The smallest unit that can sustain life on its own and makes up all living things, including the body's tissues is called as Cell. The cell membrane, the nucleus, and the cytoplasm are the three primary components of a cell. The substances that enter and leave the cell are governed by the cell membrane, which encloses the cell.
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