How do tears help to fight against diseases?

Antimicrobial properties: Tears contain several components that have antimicrobial properties, such as lysozyme, lactoferrin, and defensins. Lysozyme is an enzyme that can break down the cell walls of certain bacteria, lactoferrin binds to iron, an essential nutrient for bacteria, and defensins are small proteins that can directly kill bacteria.

Wash away harmful substances: Tears help to wash away harmful substances from the eyes, such as dust, allergens, and pollutants. This can help to prevent infections and reduce the risk of developing eye diseases.

Stimulate the production of white blood cells: Tears contain a protein called interleukin-1, which stimulates the production of white blood cells. White blood cells are essential for fighting infections.

Provide lubrication: Tears help to lubricate the eyes and keep them moist. This can help to prevent dryness and irritation, which can make the eyes more susceptible to infection.

In addition to these direct effects, tears also play an important role in the overall health of the body. They help to maintain a healthy immune system and can reduce the risk of developing systemic diseases, such as respiratory infections and cardiovascular disease.