Which statement best describes the path of absorbed fats from digestion to the bloodstream?

Which statement best describes the path of absorbed fats from digestion to the bloodstream?

• A. Absorbed fats are transported directly into the portal blood as free fatty acids after simple emulsification.
• B. Emulsified by bile, digested by lipase into fatty acids and monoglycerides, absorbed into enterocytes, reassembled into triglycerides, packaged as chylomicrons, enter lymphatic system via lacteals, then bloodstream via thoracic duct.
• C. Fats are digested by bile alone and absorbed directly into the liver without lymph involvement.
• D. Fatty acids are converted to glucose before entering the bloodstream.

Answer: (B)

Fats are too large to go directly into the portal blood, so after digestion they travel a detour through the lymphatic system. The process starts with bile emulsifying fats to increase surface area, allowing pancreatic lipase to break them down into fatty acids and monoglycerides. Inside the enterocytes, these pieces are reassembled into triglycerides and packed with proteins into chylomicrons. These chylomicrons are too large for blood capillaries, so they enter the lymphatic vessels in the intestinal villi (lacteals) and travel through the lymph to the thoracic duct, which drains into the bloodstream at the left subclavian vein. This path explains why fats reach the bloodstream after passing through the lymphatic system. (Note: shorter-chain fats can enter portal blood directly as free fatty acids, but long-chain fats follow this lymphatic route.)

Fats are too large to go directly into the portal blood, so after digestion they travel a detour through the lymphatic system. The process starts with bile emulsifying fats to increase surface area, allowing pancreatic lipase to break them down into fatty acids and monoglycerides. Inside the enterocytes, these pieces are reassembled into triglycerides and packed with proteins into chylomicrons. These chylomicrons are too large for blood capillaries, so they enter the lymphatic vessels in the intestinal villi (lacteals) and travel through the lymph to the thoracic duct, which drains into the bloodstream at the left subclavian vein. This path explains why fats reach the bloodstream after passing through the lymphatic system. (Note: shorter-chain fats can enter portal blood directly as free fatty acids, but long-chain fats follow this lymphatic route.)