Adrenal hormones of the fight-or-flight response act within seconds. How long can certain reproductive hormones take to produce a response in target cells?

1. Endocrine signalling is slower than neural signalling because the messenger has to travel in blood. 2. The speed varies by hormone rather than being fixed for the whole system. 3. Epinephrine and norepinephrine from the adrenal glands act within seconds, which is the fast extreme. 4. Certain reproductive hormones sit at the slow extreme, needing up to 48 hours. 5. The shorter windows offered miss that ceiling and would make endocrine signalling look almost neural. _Source: OpenStax Anatomy and Physiology (CC BY 4.0), Ch 17 "The Endocrine System", section 17.1 An Overview of the Endocrine System_