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.
epiglottis
Lower parts of the body vs. upper parts of the body, e.g. arms(upper), legs(lower).
The upper airway : hairs in the nose, mucus in the trachea & bronchia, the vocal cords (turbulence drives dust to the outside if the air flow)
The upper part of the leaf is were the most sunlight hits the leaf, so due to adaptations, chloroplasts moved to the upper parts of leaves.
lower, middle and upper
Upper epidermis and lower epidermis
The nose, pharynx, and trachea are the parts of the upper airway. The tubes of the lungs comprise the lower airway.
The glottis is dividing line between the upper and lower airway
thyroid
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.
wheezing
TONGUe
The Heimlich maneuver.
laboured or no signs of breathing/Choking.
rhonchi
some say the vocal cords (glottis) or others say a line of cartilage.
Stridor
A tube which is inserted into an incision in the trachea (tracheostomy) to relieve upper airway obstruction.