Parasympathetic Nervous System: 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.
Homeostasis: A state of equilibrium in the body maintained by various physiological processes, often disrupted during "fight or flight" response.