1. Exocrine Gland
The exocrine gland is a gland that secretes its products onto the apical surface via epithelia ducts or tubes connected to the apical surface.
2. Endocrine Gland
The endocrine gland is a gland that secretes its products basally, thus the secretion goes through the basal lamina, moves into the underlying tissue and enters the vascular system. Endocrine glands are ductless.
Paracrine Glands - Paracrine glands are similar to endocrine glands but their secretions reach the target cells by diffusion through the extracellular space. The secretory products of paracrine glands are not delivered to their target tissue via ducts or the bloodstream.
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