Answer:
Pancreas, adrenal glands, pituitary gland, thyroid
Step-by-step explanation:
The endocrine system is a collection of glands that serve various purposes in the human body. These glands regulate metabolism, growth, tissue function, sleep, mood and various other processes. The four major components of the endocrine system are the pancreas, adrenal glands, pituitary gland and thyroid. This system affects almost every organ and cell in the body.