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cells, organs & body systems


The basic unit of structure and function of living things

cell membrane

The thin covering that surrounds every cell

circulatory system

organ system made of heart, blood vessels


jellylike material inside a cell between the cell membrane and nucleus

`digestive system

organ system that turns food into nutrients that body cells need for energy, growth and repair

excretory system

organ system including the kidneys and bladder that removes waste materials from the blood


too small to be seen without using a microscope

muscular system

organ system that includes the muscles and allows the body to move

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