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