Lucille is finding it difficult to play soccer after school. her doctor thinks that her cells might not be getting enough oxygen. when lucille talked about it with a friend, her friend said there might be a problem with lucille’s respiratory system or circulatory system. what do lucille’s cells need in order for her body to function properly? how might a problem with lucille’s respiratory system or circulatory system make it difficult for lucille to play soccer?

ezra eats a cheese sandwich for lunch. cheese contains a lot of protein, and bread is mostly starch. ezra plans to play basketball later in the afternoon. he is breathing normally.

what does ezra need from the food he ate and the air he breathes so that he can play basketball? how do ezra’s body systems work together to get the molecules he needs into his cells? how do his cells use these molecules to release energy for his body to run?