Air is warmed and moisten as it moves through both the mouth and nasal passages

That is true. Your body heat attempts to bring the cool air in the outside environment to a temperature that will not shock your lungs. This is the reason that when you go outside on a cool day, you can see your breath, since the warm moist air in your lungs is condensing in the cool, dry air outside.
Hope that helped! =)

Hair follicles, blood, etc.

Difference between normal and abnormal tissue is much clearer on mri than on ct and mri much suitable to view soft tissues