Colorado Esthetician Written Practice Exam

The correct answer is the Endocrine system. The Endocrine system is responsible for regulating various body functions by releasing hormones into the bloodstream. These hormones affect growth, development, sexual functions, and overall health throughout the entire body. The other options, such as the Circulatory system, Excretory system, and Integumentary system, do not primarily govern these functions related to specialized glands and hormone secretion.