Which cell type is responsible for the immune response?

The white blood cell, or leukocyte, is primarily responsible for the immune response in the body. These cells play a crucial role in defending against pathogens such as bacteria, viruses, and other foreign invaders. There are different types of white blood cells, including lymphocytes (such as T cells and B cells), neutrophils, macrophages, and more, each with specialized functions in the immune system.

For instance, T cells are involved in cell-mediated immunity, helping to identify and destroy infected cells, while B cells are essential for producing antibodies that neutralize pathogens. The ability of white blood cells to recognize and respond to foreign substances is fundamental to the immune response, allowing the body to effectively defend itself and maintain health.

Other cell types listed do not primarily function in immune response. Red blood cells are mainly involved in transporting oxygen and carbon dioxide, platelets are crucial for blood clotting and wound repair, and glial cells support and protect neurons in the nervous system. Thus, the clear role of white blood cells in immune processes confirms why they are the correct answer for this question.