Answer :
Answer:
immune and respiratory
Explanation:
- Mucus is a transparent, watery secretion produced by the respiratory system particularly, the mouth, sinuses, throat, lungs and intestines.
- Mucin, a major component of mucus, can act as protective substances and lubricants.
- Mucus produced in the nose and sinuses helps trap pathogenic bacteria in the lining of the respiratory tract.
- This trapping of pathogens is part of the innate immune system and the body's first line of defense against pathogens.
- Mucins have also been known to help break down bacterial biofilms i.e (a thick layer of bacteria).