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Circulatory system: the blood circulation with heart, arteries and veins.
Digestive system: processing food with mouth, esophagus, stomach and intestines.
Endocrine system: communicating within the body using hormones.
Excretory system: eliminating wastes from the body
Immune system: defending against disease-causing agents.
Integumentary system: skin, hair and nails
Muscular system: moving the body with muscles.
Nervous system: collecting, transferring and processing information with brain and nerves.
Reproductive system: the mating organs.
Respiratory system: the organs used for breathing, the lungs.
Skeletal system: structural support and protection through bones.
Sensory system: Includes eyes, ears, nose, tongue, skin.
And that's 12!