What are the 3 adaptations of the stomach small intestines?

The stomach has several adaptations, including a thick muscular wall that aids in churning food and mixing it with digestive juices, a lining that secretes gastric acid and enzymes for protein digestion, and a mucous layer that protects the stomach from its own acidity. The small intestine is adapted for nutrient absorption with its extensive surface area created by villi and microvilli, a highly vascularized structure for efficient nutrient transport, and specialized cells that produce digestive enzymes and absorb nutrients. Together, these adaptations enhance digestion and nutrient uptake in the gastrointestinal tract.