It's an organ. The organ system it belongs to is the digestive system, and it is made up of several types of tissues (epithelial, muscle, etc.), so it can't be a system or tissue in itself.
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Organ. There are the 5 basic levels of organization. Cell, tissue, organ, organ system and organism
We don't share a small intestine; however, it either isor is an organ system (depending on how they divide the world these days).
Yes, it is part of the small intestine. It is an organ.
Not only organ a whole organ system it's preset such as small intestine large intestine esophagus kidney liver stomach
The digestive system
The stomach is the main organ responsible for digesting proteins. It secretes enzymes like pepsin and hydrochloric acid to break down proteins into smaller peptides and amino acids for absorption in the small intestine.
small intestine