Matching Pairs Natural ScienceOnline version Vocabulary by Marta Castaño 1 Our teeth chew the food in the mouth 2 It carries oxygen in the blood 3 the food goes to the stomach 4 The heart pumps blood 5 It gives us the oxygen we need to live 6 We breathe air through our nose It's the digestive system It's the respiratory system It's the circulatory system It's a digestive system It's a circulatory system It's a respiratory system