Tears act as a physiological barrier to the entry of microorganisms in the human body.

Tears play an essential role in protecting the eyes and preventing the entry of microorganisms into the body. They are produced by the lacrimal glands and contain several components that act as barriers to microorganisms.

Composition of Tears:
Tears are composed of water, electrolytes, proteins, antibodies, and enzymes, all of which contribute to their protective function.

Key Components:
1. Lysozyme: Tears contain the enzyme lysozyme, which has antimicrobial properties. Lysozyme can break down the cell walls of certain bacteria, making them less likely to survive in the eye.

2. Antibodies: Tears also contain antibodies, such as IgA, that help in neutralizing and preventing the entry of microorganisms. These antibodies bind to the pathogens, preventing them from attaching to the surface of the eye and causing infection.

3. Proteins: Tears contain various proteins, such as lactoferrin and lipocalin, which have antimicrobial properties. These proteins can bind to iron, an essential nutrient for bacterial growth, thereby inhibiting bacterial proliferation.

4. Mucus: The tear film also contains a layer of mucus that helps in trapping and removing microorganisms and foreign particles from the surface of the eye.

Function:
When tears are produced, they spread across the surface of the eye, forming a tear film. This tear film acts as a physical barrier to the entry of microorganisms. It helps in washing away any foreign particles or microorganisms that may come into contact with the eye.

Additionally, tears have a lubricating effect that facilitates blinking and prevents the accumulation of debris or microorganisms on the surface of the eye.

Conclusion:
In conclusion, tears act as a physiological barrier to the entry of microorganisms into the human body. They contain various components, such as lysozyme, antibodies, proteins, and mucus, which help in neutralizing, trapping, and removing microorganisms from the surface of the eye. This protective function of tears plays a crucial role in preventing eye infections and maintaining ocular health.

Tear is right ans