Final answer:
TH2 cells stimulate naïve B cells to secrete antibodies, protecting against extracellular pathogens and regulating allergic reactions.
Step-by-step explanation:
The type of T helper cell that regulates allergic reactions and protects against extracellular pathogens is the TH2 cell. These cells stimulate naïve B cells to secrete antibodies and are particularly important for extracellular infections caused by certain bacteria, helminths, and protozoa. As a part of the adaptive immune response, TH2 cells play a crucial role in the body's defense by promoting the humoral immune response and are also involved in the development of allergic reactions.
The T helper 2 (TH2) cell is a pivotal player in the immune system, specializing in the regulation of allergic reactions and defense against extracellular pathogens. Notably, TH2 cells activate naïve B cells, instigating the production and secretion of antibodies. Their significance is underscored in combating extracellular infections induced by specific bacteria, helminths, and protozoa. As integral components of the adaptive immune response, TH2 cells assume a crucial role in the body's defense mechanisms, particularly by promoting the humoral immune response through antibody-mediated immunity. However, this functional prowess is a double-edged sword, as TH2 cells are also implicated in the initiation and exacerbation of allergic reactions. The dual role of TH2 cells exemplifies their versatility in orchestrating immune responses against both pathogens and allergens, contributing to the intricate balance of immune regulation in the body.