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Question

A lymphoid tissue similar to the lining of the respiratory system, digestive system and urogenital tract, present in the nasal passage is called as


A
Peyer's patches
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B
MALT
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C
Tonsils
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D
NALT
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Solution

The correct option is D NALT

Mucosal membranes are continuously exposed to enormous amounts of antigenic material, the mucosa is not only a barrier for harmful pathogens but also induction sites for protective immune reactions. Nasal-associated lymphoid tissue (NALT) is a structure of the nasal immune system that acts as a target tissue in strategies of local defence. NALT represents the immune system of nasal mucosa and is a part of mucosa-associated lymphoid tissue (MALT) in mammals. It protects body from airborne viruses and other infectious agents.

Mucosa-associated lymphatic tissue (MALT) is a diffuse system present in the submucosal membranous site of lymphoid tissue found in small concentrations in various sites such as the gastrointestinal tract, nasopharynx, thyroid, breast, lung, salivary glands, eye, and skin.

Peyer's patches are the lymphoid follicles present in the lining of the small intestine. Lymphoid follicles are small organs of the human lymphatic system which are similar to lymph nodes.

Tonsil is a part of the human immune system located in the throat and palate region which is filled with lots of white blood cells. Due to its presence near the mouth, it is responsible for killing germ cells and preventing their entry inside the body through the mouth or nose.


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