Question

question 4 the endocrine system consists of a series of glands that produce chemical substances known as a factors b hormones c neurotransmitters d proteins 1 point

Explanation:

The endocrine system is made up of glands that secrete hormones into the bloodstream to regulate bodily functions. Hormones are the chemical messengers produced by these glands. Neurotransmitters are related to the nervous - system, proteins are large biological molecules with various functions, and "factors" is a very general term.

Answer:

B. hormones