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