How does the immune system work together with the circulatory system to function properly?

A

Red blood cells move through the body (to parts where they are needed) in the blood vessels of the circulatory system to fight infection.

B

The white blood cells of the immune system fight and destroy pathogens.

C

Pathogens released by immune cells cause increased blood flow to the infection site, which brings other pathogens to the area more quickly.

D

The infection site receives oxygen-depleted blood from the circulatory system's arteries, so the immune system works harder.