Exercise is also prescribed as an adjuvant treatment for depression. Most probably is acts by:

Ans. is 'c' ie Raising endorphin levels (Ref: Kaplan and Soddok's Comprehensive Textbook of Psychiatry 7/e, p106, 107)."It is well known that exogenous opioids (eg heroin, morphine) can induce a euphoric mood state and that exercise increases release of endogenous opioids and is associated with mood enhancement - Kaplanb endorphin is the principal endogenous opiods.The best documented function of endogenous opiates is in analgesia and alteration of pain perception.