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education/nutrition/Digestive System.md
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@ -17,5 +17,14 @@ Absorption is the uptake and removal of nutrients from the digestive tract.
5. Large intestine
6. Rectum
7. Anus
## S
## Sphincters
Sphincters are thickened regions of circular muscle that control the flow of contents at various points in the GI tract.
- Contracted:
- Passageway closed
- Flow is restricted
- Essential for normal digestion and absorption
There are 3 main sphincters associated with digestion:
1. Gastroesophageal/lower esophageal/cardiac - connects the esophagus to the stomach
2. Pyloric - connects the stomach to the duodenum (small intestine)
3. ileocecal valve - Connects the small intestine to the large intestine
The upper esophageal sphincter is at the top of the esophagus (not as important).