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The site by which a pathogen enters the body is called:

A.

Portal of entry

B.

Blood

C.

Respiratory tract

D.

Inflammation

Answer and Explanation

The Correct Answer is A

A. The portal of entry is the specific site or pathway through which a pathogen enters the body, such as the skin, mucous membranes, or respiratory and digestive tracts.
B. Blood is not the site of entry but rather a medium that can carry pathogens throughout the body once they have entered through a portal of entry.
C. The respiratory tract is a common portal of entry for many pathogens (like viruses or bacteria), but it is just one example of a portal of entry, not the general term for it.
D. Inflammation is an immune response to infection or injury, not a site of entry for


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Related Questions

Correct Answer is C

Explanation

A. Chyle is a type of lymphatic fluid rich in fats absorbed from the intestines, but it is not the primary basis of all lymphatic fluid.
B. Secretions of lymph nodes contribute immune cells and filtering functions but do not form the main component of lymph.
C. Plasma is the correct answer. Lymphatic fluid originates from interstitial fluid, which in turn is derived from plasma that leaks out of capillaries. This fluid enters the lymphatic system and becomes lymph.
D. MALT (Mucosa-associated lymphoid tissue) is involved in immune responses in mucosal membranes but does not form the basis of lymphatic fluid.

Correct Answer is B

Explanation

A. Suppression of the immune response is primarily carried out by regulatory T cells, not B cells.
B. B cells are responsible for the production of antibodies. When activated, they differentiate into plasma cells, which secrete antibodies that target specific antigens (pathogens).
C. Phagocytosis is mainly performed by macrophages and neutrophils, not by B cells.
D. Direct destruction of foreign cells is a function typically carried out by cytotoxic T cells, not B cells.

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