Wow! That is a very thought provoking question.
Your stomach.
heart
Stomach and small intestine Protein digestion starts in the stomach, then the small intestine completely digests it.
The first major site of chemical digestion in frog is their stomach
No, there isn't an organ in the human body that starts with an F.
The mouth is where literally begins,
The first organ to develop in the embryo is the heart. It starts to form and beat as early as 3 weeks after conception.
small intestine
Yes, the liver is an accessory digestive organ, as no food goes into it.
A+ user pancreas
Your stomach.
digestion