Most of the body's cells are surrounded by a clear interstitial fluid. Vessels collect and pump the fluid to special nodes that filter out foreign cells and parts of damaged cells. When pathogens, like bacteria, reach these nodes, it stimulates the production of white blood cells to fight the infection.
What two body systems are most directly involved in fighting an infection found in the interstitial fluid?
A.
integumentary and lymphatic systems
B.
immune and lymphatic systems
C.
immune and excretory systems
D.
integumentary and excretory systems