Read the following selection from the section "What Is Intubation?"
Having a tube down your throat isn't exactly pleasant because it affects a patient's ability to talk
or eat. But it's important for getting the right amount of air into the lungs.
Which answer choice BEST supports the idea that intubation is a necessary part of ventilator treatment?
(A) But when the lungs fill up with fluid or become highly inflamed, the lungs can't expand enough, Lutchen
says.
(B) This actively pushes air into the lungs and can keep the levels of oxygen and carbon dioxide in the
blood close to normal.
(C) If the ventilator simply blew into a person's mouth, the air might expand their cheeks or leak out of their
noes instead of going into the lungs, he says.
(D) When the lungs are damaged, the millions of balloons take in oxygen and release carbon dioxide
differently than when they are healthy, he says.