Absorption in digestion is the movement of digested foods into which system?

Absorption in digestion is the movement of digested foods into which system?

• A. Blood or lymph
• B. Urine
• C. Pancreatic ducts
• D. Stomach lumen

Answer: (A)

Absorption moves digested nutrients from the gut lumen into the body's internal circulation. After digestion, most nutrients cross the intestinal lining into the blood, which carries them to the liver via the hepatic portal vein. Fats take a different route: they enter the lymphatic vessels as chylomicrons and then join the general circulation. So the system that receives absorbed nutrients is the blood and the lymphatic system. Urine is the product of filtration and excretion, not where absorbed nutrients are delivered. Pancreatic ducts transport digestive enzymes into the small intestine, not absorbed nutrients. The stomach lumen is where digestion begins, but most nutrient absorption occurs later in the small intestine and into the blood or lymph, not into the stomach lumen.

Absorption moves digested nutrients from the gut lumen into the body's internal circulation. After digestion, most nutrients cross the intestinal lining into the blood, which carries them to the liver via the hepatic portal vein. Fats take a different route: they enter the lymphatic vessels as chylomicrons and then join the general circulation. So the system that receives absorbed nutrients is the blood and the lymphatic system.

Urine is the product of filtration and excretion, not where absorbed nutrients are delivered. Pancreatic ducts transport digestive enzymes into the small intestine, not absorbed nutrients. The stomach lumen is where digestion begins, but most nutrient absorption occurs later in the small intestine and into the blood or lymph, not into the stomach lumen.