The sympathetic nervous system is part of autonomic nervous system responsible for initiating "fight or flight" response during stressful situations.
This part of the autonomic nervous system helps to conserve energy by slowing the heart rate and increasing intestinal activity.
Adrenal Medulla: It's a part of adrenal gland that secretes adrenaline and noradrenaline when stimulated by sympathetic nervous system.
A state of equilibrium in the body maintained by various physiological processes, often disrupted during "fight or flight" response.