6. What is a chemical messenger that travels through the body to a certain tissue, on which it exerts a special effect?

A. hormone
B. gland
C. target cell
D. receptor



Answer :

Final answer:

Hormones are chemical messengers that travel to target cells via the bloodstream to produce specific biological responses.


Explanation:

Hormones are organic chemical messengers released from endocrine cells that travel through the blood to interact with target cells at a distance to cause a specific biological response. Target cells have specific receptor proteins that bind with the hormone to induce a cellular change.


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