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enzymes
Most absorption happens in the small intestine.
The small, soluble molecules get through the wall of the small intestine and into the blood
blood and sperm
The de oxygenated blood from the intestine is rich in nutrients as the small intestine is the organ that involves in absorption of the digested substances. The blood from intestine passes into the liver via the hepatic portal vein. This blood is transported through the liver as the liver regulates the quantity of substances in blood. Then the blood from the liver is taken back to the right atrium of the heart through the hepatic vein.
Blood
It is to clear the unwanted substances to the large intestine and the wanted substances will be absorbed by the walls of the small intestine by the blood.
The bile salts, formed from cholesterol, are essential for the emulsification of fats and fat-soluble vitamins (vitamins A, D, E, and K) before they can be absorbed from the intestine.
Blood leaves the intestine through the hepatic portal vein and goes to the liver.
The kidneys.
blood carry gases like o2,co2...nd the exchange of substances take place in small intestine
Digested food such as glucose, amino acids in blood plasma.