Hormones are effective means for coordinated communication throughout the body.

Question

Hormones are effective means for coordinated communication throughout the body. How is it that one single hormone might have multiple effects through its action on different organs?

A. Different organs might have different cell surface receptors that are capable of binding to the hormone and triggering different effects, depending on the organ. B. One hormone may have several different structures, resulting in different effects in different organs. C. The amount of hormone secreted into the blood stream can vary, resulting in differing effects on different organs. D. The same receptor for a hormone will be found on different organs, resulting in different intra-cellular effects E. None of the above; every hormone produced has one and only one effect.

Explanation / Answer

A. Different organs might have different cell surface receptors that are capable of binding to the hormone and triggering different effects, depending on the organ.

For example, the hormone adrenaline released from the adrenal glands binds to different types of adrenergic receptors namely alpha and beta, which trigger different intracellular responses.

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