What factor ensures that a hormone's impact is precisely targeted despite being delivered systemically via the bloodstream?

Answer

Only cells possessing the correct docking points, or receptors, are affected.

Hormones only affect cells that possess the correct docking points, or receptors, which ensures that their impact is precisely targeted whether the goal is muscle contraction or mood regulation.

What factor ensures that a hormone's impact is precisely targeted despite being delivered systemically via the bloodstream?
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