Biology – The circulatory system | e-Consult

(a) Identification of the White Blood Cell:

This white blood cell is a lymphocyte.

(b) Role of the Lymphocyte in Defence Mechanisms:

Lymphocytes are key components of the adaptive immune system. There are several types of lymphocytes, including B lymphocytes (which produce antibodies) and T lymphocytes (which directly attack infected cells or help coordinate the immune response). Lymphocytes are responsible for specific immunity, meaning they can recognize and target specific pathogens. They play a crucial role in developing immunological memory, allowing the body to mount a faster and more effective response upon subsequent encounters with the same pathogen. T lymphocytes can also act as cytotoxic cells, directly killing infected or cancerous cells. B lymphocytes differentiate into plasma cells, which produce antibodies that bind to pathogens, neutralizing them or marking them for destruction by other immune cells.