What does the circulatory system distribute to the body as it works with the respiratory system?

The circulatory system and the respiratory system both work to distribute  oxygen which are contained in the blood vessels to the different parts of your body. On the other hand, blood vessels also take out carbon dioxide from the body.

Depression is lifelong, though you can get medication to with it. the difference between sadness and depression is that sadness lasts a little bit, depression last a long time and it goes on and off. people usually get depression through experiences they have been through, or genetics.