# Glands --- **Glands** are structures that secrete a wide variety of substances both into and out from the body. They are generally made up of [[epithelial tissue|glandular epithelial tissue]] and come in all shapes and sizes. There are two types of glands, endocrine and exocrine - [[endocrine gland|endocrine glands]] which secrete substances directly into the blood, - [[exocrine gland|exocrine glands]] release their various contents through ducts to the surface or the epithelial tissue they live in. - Remember, even if they are "on the surface" this can still mean "inside the body", such as when the [[pancreas]] secretes enzymes into the intestines to aid in digestion. ___