★ Must-know
📌 The upper digestive tract is lined mainly by tough stratified squamous epithelium, whereas the lower tract is lined mainly by delicate glandular columnar epithelium.
Further detail
Mouth → pharynx → esophagus → stomach → intestines
1. What is the approximate length and overall form of the digestive system?
2. Which sequence correctly lists the major regions of the digestive tract from the mouth onward?
3. Which epithelial pairing correctly distinguishes the upper and lower digestive tracts?
What is the digestive system?
A tube from mouth to anus about 9 meters long.
Which organs make up the digestive tract?
Oral cavity, pharynx, esophagus, stomach, small and large intestines.
What epithelium lines the upper digestive tract?
Tough stratified squamous epithelium.
What epithelium lines the lower digestive tract?
Delicate glandular columnar epithelium.
Name some associated digestive organs.
Liver, pancreas, salivary glands, teeth, and gallbladder.
What is the oral cavity in the digestive system?
The initial part extending from lips to pharynx.
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