Secretin (IMAGE) The University of Hong Kong Caption Secretin is involved in the activation of the subfornical organ excitatory neurons under osmotic thirst and hypovolemic thirst. Credit Dr Fengwei ZHANG Usage Restrictions N/A License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.