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Which of the following components of the immune system is involved in both innate and adaptive immunity?

A.

B cells

B.

T cells

C.

Macrophages

D.

Natural killer cells

Answer and Explanation

The Correct Answer is C

Explanation: Macrophages play a dual role in both innate and adaptive immunity. As part of the innate immune response, macrophages act as phagocytes, engulfing and destroying pathogens and debris in the body. They are also antigen-presenting cells, presenting processed antigens to other immune cells to initiate the adaptive immune response.

Incorrect choices:

a. B cells are part of the adaptive immune response and produce antibodies against specific antigens. They are not involved in the innate immune response.

b. T cells are primarily involved in the adaptive immune response and directly attack infected or abnormal cells. They are not part of the innate immune response.

d. Natural killer cells are part of the innate immune response and can directly kill infected or abnormal cells. They do not participate in the adaptive immune response.


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Related Questions

Correct Answer is A

Explanation

Explanation: B cells are a type of lymphocyte that plays a crucial role in the immune response by recognizing and binding to specific antigens. When a B cell encounters an antigen that matches its specific receptor, it becomes activated and differentiates into plasma cells, which produce antibodies against the antigen.

Incorrect choices:

b. Cytotoxic T cells are responsible for directly attacking and killing infected or abnormal cells during cell-mediated immunity. They do not primarily recognize antigens during the immune response.

c. Macrophages are antigen-presenting cells that engulf and process pathogens to present their antigens to other immune cells, such as T cells and B cells. While they are involved in antigen recognition, they are not the primary cells responsible for this function.

d. Red blood cells do not have a direct role in antigen recognition or the immune response. Their primary function is to transport oxygen throughout the body.

Correct Answer is B

Explanation

Explanation: Sjögren's syndrome is an autoimmune disorder in which the immune system attacks and damages the salivary and lacrimal glands, resulting in dry eyes and dry mouth.

Incorrect choices:

a. Rheumatoid arthritis primarily affects the joints, causing inflammation and joint damage.

c. Crohn's disease is an autoimmune disorder that affects the gastrointestinal tract, leading to inflammation and ulcers.

d. Psoriasis is a chronic skin condition characterized by red, scaly patches on the skin, and it is not related to the salivary and lacrimal glands.

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