Topics: Nervous & Endocrine Systems Quiz
Nervous or Endocrine? Slow to react, but long-lasting
A. Nervous
B. Endocrine
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Which statement best describes the chemical substances secreted by endocrine glands?
A. They are transmitted by neurons.
B. They are secreted into cells.
C. They are carried by the blood.
D. They are found only in vertebrates.