When a person’s body becomes infected by a virus, white blood cells in the blood produce specialized immune cells that help fight the virus, and protect the body from infections it can cause. The specialized immune cells, along with other cells, are circulated throughout the body so that the cells can reach the areas of the body that require an immune response. Which two body systems interact to protect an individual from a virus? A.

circulatory and immune

B.

respiratory and nervous

C.

skeletal and immune

D.

circulatory and respiratory