A hormone 'permissive effect' is best described by which of the following scenarios?
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Correct answer: Hormone A must be present for Hormone B to exert its full effect.
Permissiveness occurs when one hormone enhances the responsiveness of a target organ to a second hormone, often by increasing the number of receptors for that second hormone. For example, thyroid hormone is permissive to the actions of epinephrine on lipolysis.
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