Question

Humoral immunity is due to_____.

• A. L-lymphocytes.
• B. B-lymphocytes.
• C. P-lymphocytes.
• D. T-lymphocytes.

Answer 1

The correct option is B

B-lymphocytes.

The correct option is B.

Explanation of the correct option:

Option B:

1. B-lymphocytes are responsible for humoral immunity.
2. They secrete antigen-specific antibodies to provide immunity against an immunogen or pathogen.
3. They develop memory cells for future encounters with the same immunogen.
4. The antigen-antibody reaction leads to the activation of different phagocytic molecules which destroy the foreign immunogen.

Explanation of the incorrect option:

Option A:

1. There is no cell as L-lymphocyte.

Option C:

1. P-lymphocytes are atypical lymphocytes found in a diseased state.
2. They can be found in viral, bacterial, or parasitic infections, etc.
3. They are a signal for schizophrenic patients.
4. P-lymphocytes have a large number of basophils.
5. They may also contain vacuoles and irregularly shaped nuclei.

Option D:

1. T-lymphocytes formulate cell-mediated immunity.
2. They have specific associated antigen-presenting cells (APCs) that process the immunogen and present it onto their cell surface for T-cell receptors.
3. T-cell lymphocytes do not produce antibodies. Instead, they phagocytose the immunogen present on the APC, along with the APC.

Final answer: Humoral immunity is due to B-lymphocytes.