Concept:Sphincters act as biological valves throughout the digestive tract to regulate the forward flow of food and prevent backward contamination.
Formula:N/A
Solution:- The terminal end of the small intestine is the ileum, and the beginning of the large intestine is the colon (specifically the caecum).
- The smooth muscle ring situated exactly at this junction is accurately termed the Ileocolic sphincter (or ileocecal valve).
- It opens briefly to drop waste into the colon and closes rapidly to prevent bacteria-rich colonic feces from backflowing into the sterile small intestine.
Why other options are incorrect:The pyloric sphincter connects the stomach to the duodenum. The cardiac (lower esophageal) sphincter connects the esophagus to the stomach. The rectal (anal) sphincters are at the very end of the digestive tract.
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