<prompt> What is the best stimulus for release of vasopressinHypotonicity of extracellular fluidHypeensionHypotensionHypo-osmolality of extracellular fluid  <response>: Best most impoant stimulus for ADH - Hypeonicity Next - hypotension Water deficit extracellular osmolarity Osmoreceptors ADH secretion posterior pituitary Plasma ADH H2O permeability in distal tubules. Collecting ducts H2O reabsorption H2O excreted 1. Osmolality tonicity 2. Aerial baroreceptor reflex - aerial pressure - ADH 3. Cardiopulmonary reflexes - blood volume ADH release ADH release plasma osmolality plasma osmolality blood volume blood volume blood pressure blood pressure Nausea Hypoxia Drugs: Morphine Nicotine Cyclophosphamide Drugs: Alcohol Clonidine Haloperidol 