The glottis is dividing line between the upper and lower airway
The nose, pharynx, and trachea are the parts of the upper airway. The tubes of the lungs comprise the lower airway.
The upper airway is composed of the nasal passages, nasopharynx, mouth and oropharynx, and the hypopharynx. Basically, everything above the glottis is upper airway, everything below is lower airway.
Transverse plane divides the body into a superior (upper) and inferior (lower) portion.
Compromised neonate is a medical term used to describe an airway that is restricted or blocked. This can either be in the upper airway or the lower airway.
The diaphragm
the bronchi divides into two, right and left. the right again divides into 3 lobar bronchiloes for three lobes- upper, middle and lower. while the left divides into 2 lobar bronchioles for the two lobes of left lung i.e upper and lower.
Prolonged inspiration indicates and upper airway obstruction and prolonged expiration indicates a lower airway obstruction according to Brady Emergency Care 12th Ed.
Axial plane (Transverse Plane) which is a horizontal plane that divides the body or any of its parts into upper and lower parts. If you mean the entire body, it runs horizontality through the umbilicus or navel.
thyroid
in a set as such {2,3,4,5,6,7,8,}, 5 would be the median, 7 would be the upper quartile, and 3 would be the lower quartile. The lower quartile divides the lower half of a set of data into two equal parts
wheezing
The lower quartile divides the lower half into two equal parts.