What activity does cell 1 undertake to contribute to the body's defense against injury and infection? generalized loose connective tissue with typical cells and fibers. what activity does cell 1 undertake to contribute to the body's defense against injury and infection? generalized loose connective tissue with typical cells and fibers. differentiation to form red blood cells synthesis of protein fibers used to rebuild damaged tissue phagocytosis of foreign materials secretion of chemicals that trigger inflammation?