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