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Which of the following components of the immune system is responsible for recognizing and destroying infected or abnormal cells in the body?

A.

B cells

B.

T cells

C.

Macrophages

D.

Neutrophils

Answer and Explanation

The Correct Answer is B

Explanation: T cells are a type of lymphocyte that plays a crucial role in cell-mediated immunity. They are responsible for recognizing and directly attacking infected or abnormal cells in the body. There are two main types of T cells: cytotoxic T cells, which directly kill infected cells, and helper T cells, which assist in coordinating the immune response.

Incorrect choices:

a. B cells are responsible for the production of antibodies and are involved in the humoral immune response, which targets pathogens outside of cells. They do not directly recognize and destroy infected cells.

c. Macrophages are antigen-presenting cells that engulf and process pathogens to present their antigens to other immune cells. While they are involved in immune recognition, they do not primarily recognize and destroy infected cells.

d. Neutrophils are a type of white blood cell involved in the innate immune response. They primarily target and destroy bacteria and other foreign invaders in the body, but they do not have the specific recognition capabilities of T cells.


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Related Questions

Correct Answer is C

Explanation

Explanation:Innate immunity. Innate immunity is the body's first line of defense and provides immediate protection against infections without prior exposure to the pathogen. It includes physical barriers, such as the skin, and various cellular and chemical components.

Incorrect choices:

a. Adaptive immunity is the acquired immunity that develops after exposure to a specific pathogen or vaccination. It takes some time to mount a response and produce antibodies or memory cells.

b. Humoral immunity is a component of adaptive immunity that involves the production of antibodies by B cells to neutralize pathogens.

d. Cell-mediated immunity is another component of adaptive immunity, where T cells directly attack infected or abnormal cells.

Correct Answer is A

Explanation

Explanation: T cells are a type of lymphocyte that plays a central role in cell-mediated immunity. They can recognize and destroy abnormal cells, including cancer cells, through direct cell-to-cell interactions.

Incorrect choices:

b. B cells produce antibodies in response to specific pathogens, but they do not directly attack cancer cells.

c. Antibodies are protein molecules that can bind to specific antigens on pathogens, but they do not have a direct role in attacking cancer cells.

d. Macrophages are phagocytic cells that engulf and destroy foreign substances, including pathogens, but they are not the primary cells responsible for recognizing and attacking cancer cells.

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