Answer :
Acetylcholine is the signaling molecule is most likely responsible for an increase in digestive activity.
As a broad term for molecules that particularly attach to other molecules, "ligand" is frequently used to refer to signaling molecules (such as receptors). The message sent by a ligand is frequently transmitted inside the cell through a series of chemical messengers.
The cholinergic neurons in the brain and gut wall produce ACh, the neurotransmitter. Acetylcholine is a neurotransmitter that is released in the gut in response to luminal stimuli. It controls the flow of gut contents by promoting epithelial ion secretion and muscular activity.
Acetylcholine increases the "push" of food and juice through the GI tract by inducing a stronger contraction of the muscle layer of the digestive organs. Additionally, it increases the production of digestive fluid in the pancreas and stomach.
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