The endocrine system influences every cellular function within your body. The foundations of the endocrine system are hormones and glands. A gland is a group of cells that produces and secretes hormones. Hormones are the body's chemical messengers. They send and relay messages between different systems. Many different hormones move through the bloodstream. Most hormones are intuitively designed to affect only certain cells.
The endocrine system is also unique in that it uses glands and cells within organs that are all closely related to other body systems. The pancreas is one example; it is part of the endocrine and digestive system. Some of the major glands of the endocrine system are the hypothalamus, pituitary gland, and pancreas.
The endocrine system is instrumental in regulating mood, growth and development, tissue function, metabolism, and reproduction. In general, the endocrine system is in charge of body processes that happen slowly, such as cell growth. Faster processes like breathing and body movement are controlled by the nervous system. The endocrine and central nervous system are separate systems, but they work closely together regulate every body function properly through the neuroendocrine pathway.