Endocrine system is the system of glands of human body. Each of these glands secretes one or more different hormones in the blood for different functions. The secretions of endocrine glands are known as hormones. Each endocrine gland may secrete one or more hormones in the blood and these hormones may or may not have related functions. Generally the hormones regulate different functions of human body like growth, mood, development, and metabolism etc. The perform their function by attaching to the target cells and then communicating with them.
Endocrine Glands:

Endocrine glands are ductless glands of human body that pour their secretions (hormones) directly into the blood. They have three characteristic features that are:

They are ductless
They are highly vascularized
They possess intracellular vacuoles or granules that store the hormones
In contrast to the endocrine glands are the “exocrine glands”. The see a detailed explanation of difference between endocrine glands and exocrine glands, visit:””.

Endocrine glands of Human Body:

Endocrine glands of human body are divided into two categories; 1) Typical endocrine glands, 2) Organs having secondary endocrine function
1) TYPICAL ENDOCRINE GLANDS: These glands have primary function of producing hormones for human body. Typical endocrine glands include;