21.  Which of the following statements concerning the larynx is correct?  
A.  The larynx contains four unpaired cartilages.
B.  When the glottis closes, air is prevented from leaving the lungs.
C.  Unlike other portions of the larynx, the epiglottis consists of some bony tissue.
D.  The inferior laryngeal cartilage is the thyroid cartilage.
E.  The epiglottis is also called “Adam’s apple”.

22.  During swallowing, the opening into the larynx is covered by the  
A.  epiglottis.
B.  thyroid cartilage.
C.  cricoid cartilage.
D.  arytenoid cartilage.
E.  the “Adam’s apple”.

23.  Which of the following laryngeal cartilages are paired?
(1) epiglottis
(2) thyroid cartilage
(3) corniculate cartilage
(4) arytenoid cartilage
(5) cuneiform cartilage
(6) cricoid cartilage  
A.  1, 2, 6
B.  3, 5, 6
C.  2, 4, 5
D.  3, 4, 5
E.  2, 3, 4

24.  When these ligaments or folds come together, they prevent food from entering the lower respiratory tract.  
A.  vocal folds
B.  vestibular folds
C.  cricothyroid ligaments
D.  epiglottic folds
E.  vocal folds and vestibular folds

25.  When air passes through the glottis, which structures vibrate to produce sound?  
A.  thyroid folds
B.  ventricular folds
C.  epiglottal cords
D.  cricohyoid folds
E.  vocal folds (cords)

26.  The pitch of the sound produced by the vocal folds is controlled by the  
A.  frequency of the vibrations.
B.  amplitude of the vibrations.
C.  thickness of the thyroid cartilage.
D.  size of the glottis.
E.  force of air moving past them.

27.  The trachea  
A.  is located in the pleural cavity.
B.  has “C” shaped cartilages that form its anterior and lateral sides.
C.  is lined with keratinized squamous epithelium.
D.  bifurcates to form the bronchioles.
E.  collapses when not in use.

28.  The respiratory zone of the tracheobronchial tree includes which of the following?  
A.  trachea
B.  alveoli
C.  primary bronchi
D.  larynx
E.  tertiary bronchi

29.  Each lobe of each lung is supplied by a  
A.  primary bronchus.
B.  secondary bronchus.
C.  tertiary bronchus.
D.  bronchiole.
E.  segmental bronchus.

30.  Of the following structures, the largest in diameter is the  
A.  primary bronchus.
B.  secondary bronchus.
C.  respiratory bronchiole.
D.  trachea.
E.  tertiary bronchus.