What is the system of glands that secretes hormones into the circulatory system called?

The system of glands that secretes hormones into the circulatory system is the endocrine system. This system is essential for regulating various bodily functions, including metabolism, growth and development, tissue function, and mood, among others. Hormones are chemical messengers produced by glands such as the thyroid, adrenal glands, and pituitary gland, and they travel through the bloodstream to target organs and tissues to elicit specific responses.

In contrast, the nervous system transmits signals through neurons to enable rapid communication and responses but does not primarily involve the secretion of hormones. The digestive system is responsible for the breakdown and absorption of food rather than hormone release, and the immune system focuses on defending the body against pathogens, which involves different types of cells and mechanisms. Thus, the accurate identification of the endocrine system highlights its critical role in maintaining physiological balance through hormonal regulation.