Nutrients from digested food enter the blood stream in the small intestine through a process called.

Peristalsis is a muscular movement in which alternating waves of muscle contraction and relaxation cause food to be squeezed along the digestive tract. Most of the nutrients in the food you eat pass through the lining of your small intestine into your blood.

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Genes, choromosomes, and the nucleus (contains the DNA) are all apart of genetics.