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A chemical message needs a receiver
Hormones act on target cells with suitable receptors.
The idea
A hormone may circulate widely, but cells respond according to their receptors and signalling machinery.
An example
A signal in the blood does not make every tissue perform the same action.
Put it into practice
Ask which cells can receive the message.
Further reading: OpenStax · Anatomy and Physiology 2e ↗
Test yourself: Why do only some cells respond to a hormone?
They have the relevant receptors
Target-cell receptors help determine the response.
Explanation and illustrative examples by One Card Wiser. Source linked for further reading.
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