Endocrine System and Hormones · Zoology

Hormones are best described as:

  1. Locally acting autocrine molecules
  2. Electrochemical nerve impulses
  3. Chemical messengers
  4. Regulatory structural proteins
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Correct answer: Chemical messengers

Hormones are chemical messengers secreted by endocrine glands into the bloodstream. They act on specific target organs to regulate physiological functions.

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