system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 how does the same hormone exert different effects in different target cells?

Sorry if this is a repost. I couldn't any similar questions.
gpt
Think of a hormone as a key that turns that flips switches and turns on chemical pathways of cells. The switches they turn on are called cell receptors. Think of them as on and off switches that are turned on by the turning of the hormone key. Hormone (keys) flip very specific switches. Some cells have switches that can be turned on by the hormone key, others do not. Some cells have many switches and when they are all flipped on, they have bigger or different effects. If a cell has that specific hormone receptor (switch), then it will be activated by the hormone.