Question

Respiratory tract is composed of:

a. sinus, salivary gland, middle ear, trachea, and lungs.

b. Esophagus, stomach, intestine, and oral cavity

c. Lungs, trachea, middle ear, sinus, and conjunctiva.

d. Sinus, trachea, mammary gland, and lungs

Answer 1

Answer a) sinus, salivary gland,middle ear, trachea and lungs

The respiratory system consists of nose, nasal cavity, sinuses, pharynx, larynx, trachea and conducting passageways i.e eustachian tube, a small passage that connects the middle ear to the back of the throat behind the nose. Betting air reach the middle ear, the eustachian tube equalizes the air pressure in the middle ear to the outside air pressure. all these leads  to the exchange surfaces of the lungs that eventually helps in respiration.