The pathway by which lipoproteins (products of lipid digestion) are absorbed from theintestinal villi into the blood is
Correct answer: C. Lacteal → lymph → thoracic lymph duct → subclavian vein
- A. Epithelial cells → interstitial fluid → capillaries → subclavian vein
- B. Epithelial cells → capillaries → interstitial fluid → thoracic vein
- C. Lacteal → lymph → thoracic lymph duct → subclavian vein
- D. Lacteal → interstitial fluid → capillaries → thoracic vein
Explanation
The correct pathway for the absorption of lipoproteins involves their entry into lacteals, which are lymphatic vessels in the intestinal villi. From the lacteals, lipoproteins travel through the lymphatic system, merging into the thoracic duct. This duct then drains into the subclavian vein, allowing lipoproteins to enter the bloodstream. Options A, B, and D are incorrect because they either bypass the lymphatic system or incorrectly describe the sequence of structures involved in the transport of lipoproteins.
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About Human Digestive System
The human digestive system breaks food into absorbable molecules through mechanical processing, enzyme action and chemical conditions along the alimentary canal. Questions cover the mouth, stomach, small and large intestines, liver, pancreas and associated secretions, including the digestion and absorption of carbohydrates, proteins, lipids, vitamins, minerals and water.
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