The digestive system is an open portal system that is surrounded by white blood cells. It consists of four layers:
1) Mucosa- made up of simple columnar epithelium and is avascualr and has Rugal Folds.
2) Submuosa- made up of dense irregular connective tissue, high collagen, and is vascular and has clusters of WBCs.
3) Muscularis- this layer is circular and long (kind of like a tooth paste tube in comparison) and has contractions of smooth muscle. These contractions are regulated by the parasympathetic nervous system by the vagus nerve which constricts first the circular muscularis then the longitudinal muscularis.
4) Serosa- the last layer is made up of areolar connective tissue which makes it elastic and is vascular.
All these layers work together and have their part in the process to get rid of toxins and help digest food. The contractions have to happen at certain times in both parts in order for things o happen and work correctly. I'm surprised to know how many layers and different things each layer does just to do become the function of the stomach.
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