Which glands secrete hormones directly into the bloodstream?

Endocrine glands are specialized glands that secrete hormones directly into the bloodstream, which then transport these hormones to various organs and tissues throughout the body to regulate a wide range of physiological processes. These hormones play crucial roles in maintaining homeostasis, growth and development, metabolism, and reproductive functions.

In contrast, exocrine glands release their products through ducts to the surface of an organ or into a cavity, such as the digestive tract or skin. Salivary glands, for instance, produce saliva and secrete it into the mouth through ducts, while sweat glands primarily excrete sweat onto the skin surface to help regulate body temperature. Both types of glands serve essential functions but do not release hormones directly into the blood.

Understanding the distinction between endocrine and exocrine glands is essential in grasping how the endocrine system functions, particularly in the context of hormone regulation and the effects on various bodily systems.