I take in oxgyen from the air and send it into your bloodstream. I also remove the carbon dioxide from your body. What system am I? muscular system
respiratory system
digestive system
skeletal system please help

Match term definition ellipse a) diagonal cross section of a cylinder circle b) diagonal cross section through the widest part of a sphere sphere c) cross section parallel to the base of a cone great circle d) shape created when a semi-circle is rotated around the y-axis triangle e) perpendicular cross section of a cone