Organ systems are comprised of tissues, which in turn are composed of cells. A system's ability to function on how well its organs work together.
An organ is a collection of tissues that has been carefully structured so that they can cooperate to carry out particular tasks.
Atoms, molecules, organelles, cells, tissues, organs, organ systems, and the human organism make up the body's major organizational levels, from the most basic to the most complex. A collection of similar-looking cells that work as a single unit is referred to as a tissue. The areas between the cells are filled with a substance that is not alive, known as the intercellular matrix.
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