The heart is part of the ________ system
Circulatory
The lungs are part of the _________ system
Respiratory
Bones are part of the _______ system
Skeletal
The brain is part of the __________ system
Nervous
The ovaries are part of the ________ system
Reproductive (female)
The stomach is part of the __________ system
Digestive
Nerves are in the _______ system
Nervous
Oxygen is used in the ________ system
Circulatory/ respiratory
