"The primary function of the respiratory system is to supply the blood with oxygen in order for the blood to deliver oxygen to all parts of the body. The respiratory system does this through breathing. When we breathe, we inhale oxygen and exhale carbon dioxide. This exchange of gases is the respiratory system's means of getting oxygen to the blood." 10-09
"A tracheotomy or tracheostomy is a surgical procedure performed on the neck to open a direct airway through an incision in the trachea (the windpipe)." Provides basic information and a diagram. 01-06