Physiology: Animal Function and Reproduction

Endocrine System

How do steroid hormones differ from nonsteroid hormones?

Steroid hormones such as estrogen and testosterone enter target cells and directly interact with the DNA in the nucleus. Nonsteroid hormones such as adrenaline generally do not enter the target cell but instead bind to a receptor protein found on external cell membranes. This then causes a sequence of metabolic effects.


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