Which statement about communication signals in animals is true?
A) Most intercellular communication occurs by signals that enter cells by endocytosis.
B) Endocrine signals can be distributed through the circulatory system.
C) Endocrine glands secrete their products into ducts.
D) Endocrine cells release hormones into ducts.
E) Hormones influence only the activities of adjacent cells.

Question

Quizplus · Accepted Answer

Endocrine signals are distributed throughout the body via the circulatory system, allowing for widespread communication between cells and tissues. Option A is incorrect because most intercellular communication occurs through signaling molecules that bind to specific receptors on the surface of target cells. Option C is incorrect because endocrine glands do not have ducts and instead secrete their products directly into the bloodstream. Option D is incorrect because only exocrine glands secrete their products into ducts. Option E is incorrect because hormones can have effects on distant target cells, not just adjacent ones.

Which Statement About Communication Signals in Animals Is True