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

The immune response is primarily carried out by white blood cells, which are crucial components of the immune system. These cells are responsible for identifying and combating pathogens, such as bacteria and viruses, as well as other foreign substances that can harm the body.

White blood cells include various types, such as lymphocytes (T cells and B cells), which play specific roles in the adaptive immune response, and phagocytes, which engulf and destroy invaders. This diverse group of cells ensures that the body can respond effectively to a wide range of threats.

In contrast, red blood cells are primarily responsible for transporting oxygen throughout the body and do not play a direct role in immune responses. Platelets are involved in blood clotting, and muscle cells are responsible for contraction and movement. Therefore, the primary role of white blood cells in the immune response makes them the correct choice in this context.