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Respiratory System: controls blood supply, removes CO2; gaseous exchanges occur through the walls of the air sacs in the lungs


Lymphatic System/Immunity: Picks up fluid leaked from blood vessels and returns it; disposes debris; houses white bloods cells
- The immune response attacks against foreign substances
Digestive System: breaks down food that enters blood for distribution

Urinary System: Eliminates wastes; regulates water, electrolyte and acid/base balance of the blood
Female & Male Reproductive System: Main function is production of offspring.