Opioid secreted from anterior pituitary?: (A) b endorphin, (B) GH, (C) ACTH, (D) MSH
Answer is A. (A) b endorphin# Pro-opiomelanocortin, a large precursor molecule found in anterior and intermediate lobes of pituitary gland and brain, contains b-endorphin, a polypeptide of 31 AA residues, that has met enkephalin at its amino terminal.> There are separate enkephalin secreting and fi-endorphin secreting systems of neurons in brain.> b-endorphin is also secreted into the bloodstream by pituitary gland.