Which part of the body secretes the hormone secretin? And explain the function secretin hormone? Share with your friends Share 0 Bhavya answered this Secritin is released by duodenum which is present in intestinal glands.It helps in regulating water homeostasis throughout the body. 0 View Full Answer Priyali answered this Thanks bhavya di....Are u a neet aspirant because it was a neet question. 1 ParŢh answered this It was the first hormone that was discovered. 0 Priyali answered this Thanks parth bhaiya .I was not knowing that secretin was the first hormone which was discovered in human body. 0 ParŢh answered this Most welcome.. 0