Endocrine, paracrine, autocrine and intracrine Intracrine e Endocrine and neuroendocrine: a chemical released by a specialized Autocrine group of cells into the circulation and acting on a distant target tissue circulation Paracrine Paracrine: chemical communication between neighboring cells within a tissue or Endocrine organ circulation Autocrine a chemical acts on the Endocrine Distant glat same cel target cells e Intracrine: a chemical acting within Neuroendocrine the same cell Neurosecretory ell Distat target cells Endocrine and neuroendocrine: a chemical released by a specialized group of cells into the circulation and acting on a distant target tissue.  Paracrine: chemical communication between neighboring cells within a tissue or organ.  Autocrine: a chemical acts on the same cell  Intracrine: a chemical acting within the same cell. Endocrine, paracrine, autocrine and intracrine