The diagram shows a section through a villus.
Several hours after a meal, where will the highest concentrations of amino acids and of glucose be found in the villus?
▶️ Answer/Explanation
Ans: D
After absorption in the small intestine:
- Amino acids and glucose are transported into the blood capillaries (not the lacteals, which absorb fats).
- Several hours post-meal, these nutrients would have moved into the bloodstream for circulation.
Thus, the highest concentration is found in the blood vessel (D), as the absorbed nutrients are carried away for use by the body.
The diagram shows a cross-section of a villus. On which cell surface are microvilli found?
▶️ Answer/Explanation
Ans: D
Microvilli are tiny, finger-like projections found on the epithelial cell surface (labelled D) of villi in the small intestine. They significantly increase the surface area for absorption of nutrients like glucose and amino acids.
Other labelled structures (e.g., blood capillary A, lacteal B, or goblet cell C) do not possess microvilli. Thus, the correct answer is D (Epithelial cell surface).