The endocrine system
A) releases neurotransmitters into ducts.
B) secretes chemicals that reach their targets through the bloodstream.
C) communicates via frequency-modulated signals.
D) contains organs called exocrine glands.
E) is isolated from the nervous system.

Question

Quizplus · Accepted Answer

The endocrine system secretes hormones directly into the bloodstream to reach target organs or cells, distinguishing it from the exocrine system, which uses ducts to release substances.

The Endocrine System