Nervous system: (nerves, brain, spine, ...)
Respiratory system (nose, mouth, lungs, windpipe, ...)
Circulatory system (heart, veins, arteries, ...)
Digestive system (oesaphagus, liver, pancreas, intestines...)
Urinary system (bladder, kidneys, urine, ...)
Reproductive system (uterus, vagina, ovaries, testicles, penis, ...)