Gas exchange
transportation
Supplying the blood with oxygen (which can then be transferred to the cells ), and cleaning it from CO2 ( carbon dioxide ). Or simply: breathing.
mechanical
The primary function of the digestive system is to supply the cells of the body with nutrition. It does this by ingestion, digestion, and absorption. The waste materials that are not used are then eliminated.
Muscle.
They are pheromones.
the lymphatic system