The endocrine system consists of​

A) ​a system of ducted glands within the digestive system.
B) ​a system of ductless glands in the brain and spinal cord.
C) ​a system of ductless glands distributed throughout the body.
D) ​a system of ducted and ductless glands used for reproduction.

Endocrine System

A network of glands that produce and release hormones directly into the blood to regulate the body's growth, metabolism, and sexual development and function.

Ductless Glands

Glands that release hormones directly into the bloodstream without using ducts, also known as endocrine glands.