Question

Describe gastrointestinal tract as an endocrine organ

Answer 1

It also secretes hormones

So it can be called endocrine gland

Answer 2

The gastrointestinal tract is the largest endocrine organ in the body and the endocrine cells within it are referred to collectively as the enteric endocrine system.

Secretin: Another hormone secreted from small intestinal epithelial cells; stimulates secretion of a bicarbonate-rich fluids from the pancreas and liver.