Atelectacis affects the lungs. It is the built up secretions that set there and can't be coughed up for a variety of reasons, thereby causing other problems such as pneumonia.
Quite significantly as that body part is no longer there.
Every part of the body is vulnerable
Eye
Lung
eyes
the head
Tongue
Bones
Depressants slow (or depress) the functioning of the entire body.
It affects the kidney.
hair and nails
eyes