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