The cell that has the receptor for a certain hormone is the 'target cell'
of the hormone.
Hormone itself reach all cells, but the command of the hormone are transmitted
only to the target cells, which has the receptors for that hormone.
The organ that has a lot of target cells is a target organ.
In hormonal system, the route of orders from sender to recipient is blood
vessels. The hormone effects only the cells that have the receptor to a certain
hormone, and tells the orders.
You can call the cell, the target cell.Though hormone can be conveyed to the cell which has no receptor, it doesnft
make sense as an order.
For example, though estrogen secreted from ovary can be conveyed to all
cells of our body, it effects only the target cells like muliebria or fatty