What type of lymphocytes are responsible for producing antibodies?

B-lymphocytes, also known as B cells, are the type of lymphocytes responsible for producing antibodies. When B cells encounter an antigen, they can differentiate into plasma cells, which are specialized cells that secrete large quantities of antibodies. These antibodies are crucial for identifying and neutralizing pathogens like bacteria and viruses.

B cells also have a role in immunological memory. After an immune response, some B cells become memory B cells, which persist in the body and can mount a quicker and more effective response if the same antigen is encountered again in the future. This is an essential aspect of adaptive immunity that helps the body to remember past infections.

In contrast, T-lymphocytes (T cells) primarily function in cellular immunity by directly attacking infected cells or coordinating the immune response but do not produce antibodies. Natural killer cells are part of the innate immune system and play a role in directly killing infected or cancerous cells, rather than antibody production. Memory cells, while important in providing lasting protection, are a subset of B cells and T cells that help to remember specific pathogens but do not directly produce antibodies themselves.