alleryThe endocrine system uses ___ to coordinate body functions.
AHormones (chemical messengers secreted into blood)
BNerves
CNeurotransmitters only
DSalts
Answer & Solution
Correct answer: A. Hormones (chemical messengers secreted into blood)
**Endocrine system:** ductless glands secrete hormones directly into bloodstream.
Hormones reach target cells with specific receptors.
Slower but more sustained action than nervous system.
Two systems coordinate together (neuroendocrine integration).
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