Final answer:
The skin constantly sheds dead cells along with any microbes that may be attached to those cells.
Step-by-step explanation:
The skin constantly sheds dead cells along with any microbes that may be attached to those cells. As the dead cells are shed or removed from the upper layer, they are replaced by the skin cells below them. The primary barrier to the entrance of microorganisms into the body is the skin, as it is covered with a layer of dead, keratinized epithelium that is too dry for bacteria to grow. Additionally, sweat and other skin secretions may lower pH, contain toxic lipids, and physically wash microbes away.