ductless glands which secrete hormones directly into the extracellular fluid
What is an endocrine gland?
What are merocrine glands?
Glands which secrete their products by exocytosis as they are produced
What is a simple gland?
a gland which has an unbranched duct
(Duodenal glands of the small intenstine)
What is a hormone?
a messenger chemical