This runs the length of the pancreas. Endocrine. The endocrine gland, which consists of the islets of Langerhans, secretes hormones into the bloodstream. The enzymes secreted by the exocrine gland in ...

The release of the “feel-good” chemicals dopamine, serotonin, endorphins, and oxytocin are tied to specific lifestyle, exercise, and dietary choices. Here’s what triggers each one.