PATHOLOGY

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PATHOLOGY MCQ

IMMUNE RESPONSE

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
The eyes and the respiratory tract are both protected against infections by
A
the mucous membranes that cover their surface.
B
the secretion of complement proteins.
C
the release of slightly alkaline secretions
D
the secretion of lysozyme onto their surfaces.
Explanation: 

Detailed explanation-1: -Lysozyme, also known as muramidase, is an enzyme found in tears that is a component of the innate immune system, providing a first line of defense for the eye. Lysozyme kills gram-positive bacteria, protecting the eye against pathogens.

Detailed explanation-2: -Lysozyme is a  14 kDa protein present in many mucosal secretions (tears, saliva, and mucus) and tissues of animals and plants, and plays an important role in the innate immunity, providing protection against bacteria, viruses, and fungi.

Detailed explanation-3: -Lactoferrin (Lf) and lysozyme (Lys) are abundant in the tear fluid and have antimicrobial properties. Since the eye is a portal for infection transmission, assessment of immune status at the ocular surface may be clinically relevant.

Detailed explanation-4: -Lysozyme is the most abundant antimicrobial polypeptide in respiratory tract secretions, and local levels rise with inflammation (2).

There is 1 question to complete.
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