In endocrine signaling, the duration of the effect is typically?

• A. Long lasting
• B. Short lasting
• C. Immediate
• D. No lasting effect

Answer: (A)

Endocrine signaling produces responses that are slower to start but longer in duration because hormones travel through the bloodstream to distant targets and often trigger changes that persist after the hormone is cleared. These effects frequently involve alterations in gene expression or other long-lasting cellular programs, so once the signaling cascade is activated, the resulting changes can continue for minutes to hours or even days. This contrasts with neural signaling, where rapid neurotransmitter release yields quick onset but short-lived effects. While some hormones have shorter half-lives, the overall pattern in endocrine signaling is that the effects tend to be long lasting.