Which structure in the lining of the small intestine contains capillaries and lymphatic vessels to aid absorption?

Which structure in the lining of the small intestine contains capillaries and lymphatic vessels to aid absorption?

• A. Villi
• B. Microvilli
• C. Goblet cells
• D. Lamina propria

Answer: (A)

Absorption in the small intestine relies on structures that bring nutrients into both blood and lymphatic systems. The finger-like projections called villi line the intestinal lining, and each villus has a core of lamina propria that contains a network of capillaries and a central lymphatic vessel called a lacteal. Nutrients are absorbed: sugars and amino acids enter the capillaries, while fats enter the lacteal. Microvilli are tiny extensions on enterocytes that greatly increase surface area but do not contain vessels. Goblet cells secrete mucus, not involved in transport. The lamina propria provides the tissue housing these vessels, but the villus is the structural unit that contains them and facilitates absorption.

Absorption in the small intestine relies on structures that bring nutrients into both blood and lymphatic systems. The finger-like projections called villi line the intestinal lining, and each villus has a core of lamina propria that contains a network of capillaries and a central lymphatic vessel called a lacteal. Nutrients are absorbed: sugars and amino acids enter the capillaries, while fats enter the lacteal. Microvilli are tiny extensions on enterocytes that greatly increase surface area but do not contain vessels. Goblet cells secrete mucus, not involved in transport. The lamina propria provides the tissue housing these vessels, but the villus is the structural unit that contains them and facilitates absorption.