A sympathetic pathway begins with the activation of the hypothalamus in response to stress or danger, which then stimulates the adrenal medulla to release catecholamines like adrenaline and noradrenaline. These hormones travel through the bloodstream and bind to adrenergic receptors on target organs, leading to a "fight or flight" response. This response includes increased heart rate, dilated airways, and heightened alertness, preparing the body for immediate action. Finally, these effects are modulated as the body returns to homeostasis after the stressor is removed.
Copyright © 2026 eLLeNow.com All Rights Reserved.