Q.Where are B-cells and T-cells produced in the human body? How do they differ from each other? Mention any two differences.

(c) 900 molecules per second.

A single mature plasma cell can secrete antibodies at the remarkably high rate of about 900 molecules per second.

Plasma cells are terminally differentiated B-lymphocytes specialized for large-scale antibody (immunoglobulin) secretion as part of the humoral immune response. A single, fully mature plasma cell has an extensively developed rough endoplasmic reticulum and Golgi apparatus dedicated to antibody synthesis and secretion, enabling it to produce and rel …

Plasma cells are antibody 'factories' -- the effector form that activated B cells become.

When a B lymphocyte encounters its specific antigen (often with helper T-cell assistance), it proliferates and differentiates mainly into plasma cells, which are packed with extensive rough endoplasmic reticulum specialised for synthesising and secreting large quantities of antibody (immunoglobulin) molecules matching that antigen. Killer (cytotoxic T) cells directly destroy infected/abnormal cells rather than secreting antibody; memory cells persist long-term to enable a faster response on re-exposure but do not thems …

Basophils are the blood cells that contain heparin.

Basophils are granulocytic white blood cells whose cytoplasmic granules store heparin (an anticoagulant that inhibits blood clotting) and histamine (involved in inflammatory/allergic responses); tissue-resident mast cells, which are related to basophils, perform a similar role. Lymphocytes, neutrophils and monocytes are other leukocyte types with different primary functions (antibody production/cell-mediated immu …