_____ measures the extent to which the body's cells are able to kill foreign organisms.

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Cytotoxicity refers to the ability of cells to kill or destroy foreign substances or cells. This is often measured in laboratory settings by assessing how well immune cells, such as T cells or natural killer cells, are able to eliminate target cells in test tubes or in vivo. Other factors, such as cytokine production, can also contribute to a cell's ability to kill foreign organisms, but cytotoxicity is a key measure of how well a person's immune system is functioning.

_____ Measures the Extent to Which the Body's Cells Are