- Acts on collecting duct by inserting aquaporins
flowchart TD SR[Stretch receptors<br/>sense low / high<br/>blood volume] OR[Osmoreceptors<br/>sense high / low<br/>osmolarity] ADH[↑ ADH / ↓ ADH<br/>in posterior pituitary] H2O[Increased / decreased<br/>water reabsorption<br/>in kidneys] SR -->|Afferent activity<br/>on CN IX & X| ADH OR --> ADH ADH --> H2O