posted by Jamie .
which of the following summarizes the function of the respiratory system?
1) transport oxygen to cells and wastes away from ells.
2)to protect the organs in the chest cavity.
3)to move oxygen from the air into the body and carbon dioxide from the body into the air
4) to provide a barrier between the body and the environment.
I think #3. Can you check for me.
Many thanks for your help.