The Endocrine system

• Endocrine glands and organs excrete hormones
• Hormones can be large or small
• Hormones transfer information and instructions from one set of cells to another via chemical messages
• Plays a huge role in regulating mood, growth and development, tissue function, metabolism, sexual function and reproductive processes
• In charge of body processes that happen slowly 
• A gland is a group of cells that produces and secretes chemicals
• Endocrine glands are glands that release more than 20 major hormones directly into the bloodstream where they can be transported to cells in other parts of the body
• Exocrine glands (e.g. sweat and salivary glands) release secretions in the skin or inside the mouth, out through a duct