Which of the following cells is primarily involved in the immune response in the body?

Lymphocytes are a critical component of the immune system, playing a key role in identifying and responding to foreign pathogens such as bacteria, viruses, and other harmful substances. They are a type of white blood cell and are primarily responsible for adaptive immunity, which includes the activation of T cells and B cells. T cells help in directly killing infected host cells or activating other immune cells, while B cells are responsible for producing antibodies that specifically target pathogens.

In contrast, neurons are specialized cells responsible for transmitting nerve impulses and do not hold any primary role in the immune response. Adipocytes are fat cells involved in energy storage and regulation of metabolism, and fibroblasts are cells that contribute to the structure of connective tissues, playing significant roles in wound healing and tissue repair. However, neither adipocytes nor fibroblasts have functions that directly pertain to the immune response. This delineates lymphocytes as the primary cells involved in orchestrating the body’s immune defense.