Endocrine System – glandular system that uses hormones to regulate body functions
A.	Structures
1.	glands – cells or organs that selectively remove, concentrate or alter materials
                  in blood and then secrete back
2.	hormones – proteins that move through blood to target tissues
3.	endocrine glands
4.	exocrine glands – secrete products via ducts usually to epithelial surfaces
5.	prostaglandins – hormone-like fatty acids
B.	Function
1.	negative feedback – desired effect reached – inhibits further hormone production 
         until needed again
2.	positive feedback – increased production of hormone
Pituitary Gland
Thyroid
Adrenal Glands
Pancreas