Human Physiology in Water Reabsorption Mechanisms via Antidiuretic Hormone
Antidiuretic Hormone (ADH), synthesized in the supraoptic nucleus and released from the posterior pituitary, regulates blood pressure and fluid balance through distinct receptor-mediated mechanisms. Binding to V2 receptors on collecting duct cells induces the insertion of aquaporin-2 channels, facilitating facultative water reabsorption that is independent of solutes, while activation of V1 receptors causes vasoconstriction and V3 receptors stimulate ACTH release for cortisol production. These pathways collectively increase plasma volume and systemic vascular resistance to maintain homeostasis under conditions of hypertonicity or hemorrhage.
Human Physiology in Water Reabsorption Mechanisms via Antidiuretic Hormone
Antidiuretic Hormone (ADH), synthesized in the supraoptic nucleus and released from the posterior pituitary, regulates blood pressure and fluid balance through distinct receptor-mediated mechanisms. …