Parts of the respiration system include the larynx (opening of nose), pharynx (oropharynx, nasopharynx, laryngopharynx), true and false vocal cords, trachea (16-20 C-shaped cartilages, trachealis muscle), conducting airways (trachea -> terminal bronchioles), right and left mainstem bronchi, right main bronchus, right lung (divided into upper, middle and lower lobes), left lung (upper and lower lobes), pleural sac (surroundings of lungs), ribs and costal cartilages (12 pairs, 7 pairs of true ribs, 5 pairs of false ribs, 11-12th ribs are floating ribs), sternum (breastbone, manubrium, body, xip