Work Step by Step
Option a. is incorrect. EPO stimulates the production of red blood cells in the red bone marrow. Option b. is incorrect. Melatonin helps govern our sleep-wake cycle. Option c. is incorrect. Cortisol helps us regulate our metabolism and other processes. Option d. is incorrect. Prostaglandins causes us to feel pain and can cause muscles to contract. Option e. is correct. Leptin is a hormone produced by fat tissues and acts on the satiety center in the hypothalamus, signaling to us that we are full.