Second messenger-activating hormones circulate in minute quantities because:

A. they are not important signal molecules.
B. small concentrations of hormone can activate many intracellular signals via amplification.
C. they are continuously released from the gland.
D. neurotransmitters also bind to hormone receptors.


Answer: B. small concentrations of hormone can activate many intracellular signals via amplification.

Anatomy & Physiology

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