The blood gets the nutrients and the gases from the capillaries in the small intestine.
Digestion is completed and absorbed into the bloodstream
Probably what happens in every other part of the body, due to osmosis and dispersion, the oxogen goes out of the blood and nourishes the cells. Meanwhile the Carbon dioxide attaches to the hemoglobin and is carried back to the lung to be exhaled.
the unabsorbed food in the small intestine passes through the ileocecal valve to the large intestine where, after the last few nutrients and fluids are reabsorbed, it is defecated.
Blood passes through the capillaries, which provide a passage way for the blood from the arteries to the veins. The tiny, thin walled capillaries also allow for the exchange of gases through the tissue. You can read more about capillaries at fi.edu
Blood passes through capillaries as a means of either passing products to the cells or picking up things from the cells. The small intestine is where most digestion takes place so the capillaries pick up digested material to take to the liver via the portal system. The digested fat is picked up by the lymph capillaries, lacteals, which returns to the blood when the lymph connects to the right and left subclavians.
Oxygen passes from the blood into organs through the wall of capillaries.
oxygen
There is an exchange with oxygen, nutrients, and carbon dioxide and water vapor.
mouth gut small intestine large intestine
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aerteries
Indigestible material in the small intestine is moved to the large intestine for further processing. It passes through the digestive system and eventually exits the body as waste. The small intestine absorbs nutrients from the digested food and liquids before passing on the indigestible material.