The respiratory system is the system in which you use to breathe. when you breathe in, you get oxygen from the air which hen goes into the circulatory system, which sends blood and oxygen through the body and to all the vital and non vital organs. When you breathe out, the respiratory system releases CO2 which can cause your blood pH to drop if contained in your body. These two systems basically keep you alive.
Lisa should visit a doctor and take a break from going to clubs and playing sports until she is feeling well. It is obvious that Lisa is sick and needs rest and time to get over the sickness.
