How Feelings of Joy Affect <br />Your Body Physically 1. Your brain. When you're happy, your brain releases dopamine and <br />serotonin into your central nervous system. <br />This tells your whole body that you feel good. 2. Your circulatory system. Dr. Diana Samuel, via Healthline Joy isn't the only emotion to <br />affect this system, however. Fear, sadness <br />and other emotions take their turns as well. 3. Your autonomic <br />nervous system. This is your bodily system that works without <br />your conscious effort. Things like breathing and <br />digestion are handled with this system. It can be affected by joy, <br />for example, with rapid breathing, salivation, <br />sweating, body temperature and metabolism.