The speedy nervous system zips messages by way of neurotransmitters. Endocrine messages, however, are delivered more slowly because hormones travel throughA. myelinated neurons. B. the bloodstream. C. glial cells. D. interneurons.

B) the bloodstream

Explanation:

In multicellular organisms, the cells of the organisms are interconnected and communicate with each other through the secreted chemicals. When the communication takes place between distant cells then the body releases the chemicals called hormones.

The hormones reach distant sites through the bloodstream and act on the target site. This signaling communication is known as the endocrine signaling in which the endocrine glands secrete the chemicals into the bloodstream.

Thus, Option-B is the correct answer.