Question

how does saliva,sweat,tears,nasal secretion kill the germs

Answer 1

• Human saliva is a watery solution that is made up of 99.5% water and 0.5 % other substances like electrolytes, mucus enzymes and other antimicrobial substance. Saliva contain Lysozyme and secretory IgA, which has antimicrobial property.
• Lysozyme can damage bacterial cell wall by the hydrolysis of it.
• Lysozyme is also found in tears and has the same function.
• Our sweat glands present on skin also produce such chemicals that kill or inhibit many microbes.
• Nasal secretions contain nasal mucus. This viscous secretion is able to trap bacteria of many infectious disease from entering our respiratory system. Nasal mucus also contain lysozyme which kills germs.