Here's why:
* Endocrine glands are ductless glands. This means they don't have a specific duct or tube to transport their secretions. Instead, they release their hormones directly into the surrounding interstitial fluid, from which they diffuse into the bloodstream.
* Exocrine glands on the other hand, secrete their products into ducts that carry the secretions to a specific location, like the surface of the skin or the lumen of an organ.
Let me know if you'd like to know more about endocrine glands or specific examples!