What is the function of lysozyme in the human body?

Lysozyme plays a crucial role in the immune defense system by breaking down bacterial cell walls, which provides antimicrobial activity. It is an enzyme that targets the peptidoglycan layer found in the cell walls of many bacteria. When lysozyme cleaves the bonds within this layer, it leads to the lysis (breaking down) of the bacterial cell, making it an effective agent against bacterial infections.

This function is particularly important for protecting the body from bacterial pathogens, as lysozyme is present in various secretions such as saliva, tears, and mucus, as well as within immune cells. Its ability to disrupt the structural integrity of bacteria contributes to the innate immune system's first line of defense.

In contrast, the other options do not accurately reflect the role of lysozyme or its mechanism of action. Providing nutrients to cells, enhancing virus replication, or destroying human cells are not functions associated with lysozyme, which specifically targets bacterial cells.