and cells. The lowest level of organization is that of chemicals that make up all matter. An organ is a unique anatomic structure consisting of groups of tissues that work in concert to perform specific functions.  There are only four types of tissues that are dispersed throughout the body: epithelial tissue, connective tissue, muscle tissue, and nerve tissue.

Cells are the smallest components and perform all the basic life functions. While the human body is made up of several trillion cells, they are of approximately 200 specific cell types.  Toxins can injure any