This BioL-O-Gee R.A.P. song explains the functions of the human respiratory system as air passes in and out of the respiratory tract during one breathing cycle. The processes of inhalation, gas exchange, exhalation, oxygen transport and carbon dioxide transport are described in a clear and upbeat way. Be sure to check out the corresponding BioL-O-Gee R.A.P. "Respiration" animated music video.