Ans. (D). mucus and stomach acid.
The first line of defense can be defined as the defense system that inhibits the entry of disease-causing pathogens or their components. It includes tears, skin, mucus, stomach acid, good bacteria, cilia, and neutrophils.
Pathogens present in food substances killed by antimicrobial substances present in saliva, mucus produced by epithelial lining of gastrointestinal tract, and stomach acid or hydrochloric acid. So, if a pathogen present in food got past saliva, it would be targeted by mucus and stomach acid.
Thus, the correct answer is option (D).
The first line of defence can be defined as the defence system that inhibits the entry of disease-causing pathogens or their members. It has tears, skin, mucus, stomach acid, good bacteria, cilia, and lymphocytes.
The first line of protection is defined by the people on the front lines. They're driving risk, complying with regulations and standards, and taking out the company's defined risk management processes daily.
The second line of defence is executive and is liable for oversight of the doers.
Thus, option "A" is correct, stomach acid and lymphocytes.
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