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endocrine signaling. Signaling in which endocrine cells release hormones that act on distant target cells.
The endocrine system. The key organs in endocrine signalling are glands. Glands are the target for signals, often coming from the brain. In response to these signals they will release the appropriate hormone. A gland involved in endocrine signalling specifically releases hormones into the bloodstream. Hormone released from the pituitary gland: thyroid stimulating hormone (TSH) . 2  Key gland and hormones: thyroid gland. 3  Releases thyroxine (T4) which is converted to its active form triiodothyronine (T3) in the target tissue.