The body fights infection through the use of?

The body fights infection through the use of body secretions, which include various fluids produced by the immune system and other organs. These secretions play a critical role in the first line of defense against pathogens. For example, mucus traps microbes and debris, saliva contains antibacterial enzymes, tears flush out irritants, and sweat can create an acidic environment that inhibits the growth of bacteria. Body secretions not only help in physically trapping and eliminating pathogens but also contain antibodies and other antimicrobial substances that actively neutralize harmful invaders.

While muscle contractions, skin barriers, and nerve impulses all contribute to the body’s overall functioning, their roles in fighting infections are indirect or secondary compared to the primary defensive measures provided by body secretions.