Saliva is also antibacterial. because the nasal passage and lungs are coated in , many germs are trapped in this substance and soon down the esophagus.

Saliva is secreted from the salivary gland and they are watery substances formed in the mouth of animals. In Human, saliva is made up of 98% water, mucus, electrolytes, epithelial cell, and electrolytes. However, saliva contains mediators such as mucus secreted by esophagus and lactoperoxidase enzymes.

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