511 Area Code 511. At AreaCode.org, you'll find helpful information on the 511 area code, including 511 area code location. Other phone area codes may be found using AreaCode.org's area code locator. Use the search function for area code look up.
Oxytocin is released into the bloodstream as a hormone in response to stretching of the cervix and uterus during labor and with stimulation of the nipples from breastfeeding. This helps with birth, bonding with the baby, and milk production. Oxytocin was discovered by Henry Dale in 1906.
True endocrine glands probably evolved later in the evolutionary history of the animal kingdom as separate, hormone-secreting structures. Some of the cells of these endocrine glands are derived from nerve cells that migrated during the process of evolution from the nervous system to various locations in the body.