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why should the blood going away from stomach and intastines pass through liver and not directly through heart

Before reaching the heart, blood from stomach and intestine pass through the liver. Blood coming from stomach and intestine carries absorbed nutrients which are deposited in the liver. The liver cells absorb all the nutrients from the blood. From liver again blood without nutrients pass to the heart to become purified. Liver helps in screening and purifying several types of toxins mixed with the nutrients before sending them to the cells.

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because the blood needs a cleanup before reaching the heart so that it cant cause heart  disease . as, the blood from stomach may contain any bad bacteria as there is healthy and unhealthy  food bacteria in our stomach that may be good or bad.if you like it then give a thumbs up to me

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nice answer!!

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liver monitors the substances before passing them into the body for eg excess glucose is retained in the form of glycogen and exess amino acids are broken down by the liver. harmful chemicals are detoxified and bacteria are destroyed and excess mineral,water and vitamins are stored in the liver

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because toxic substances directly go to the heart and cause damage to it

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