health science

the circulatory system is considered a transport system because the blood carries important materials throughout your body. some carry wastes out of your body. the respiratory system is considered one because it gives blood cells oxygen which they need and it also gets rid of rid of carbon dioxide a.k.a. a waste gas.the digestive is considered it because it sends the food down to the stomach to be digested and takes out the nutrients. excretory is the same thing because it takes out wastes and then allows them to leave the body.