300
Name two different organ systems and three organs that exist in each organ system.
Skeletal-backbone, skull, rib cage, breastbone, hipbone, pelvis
Circulatory - heart, veins, arteries, capillaries
Digestive - stomach, esophagus, saliva glands, liver, large and small intestines, pancreas
respiratory - voice box, bronchial tubes, windpipe, alveoli