BIOD 151 MODULE 2 EXAM ANSWER KEY
(PORTAGE LEARNING)
"Explain atleast TWO differences between Type I and Type II Alveolar cells - CORRECT ANSWER a. Type
I form the very thin simple squamous epithelium of the alveoli in junction with capillaries. Make up
roughly 95% of alveolar epithelial cells.
b. Type II produce and secrete pulmonary surfactant which is needed throughout the alveolar surface to
keep the alveoli open. In addition, type II cells can divide to replace damaged type I cells. Makeup
roughly 5% of alveolar epithelial cells."
"What us not true of the respiratory physiology? - CORRECT ANSWER Tidal volume is the maximum
amount of air able to be inhaled beyond normal inhalation"
"The Vestibule is the most external portion of the nasal cavity (T/F) - CORRECT ANSWER True"
"The vestibule is lined with typical respiratory epithelium (T/F) - CORRECT ANSWER False (stratified
squamous epithelium is found in the vestibule)"
"Because of diffusion, oxygen naturally moves out of the blood and into the lungs (T/F) - CORRECT
ANSWER True"
"Why would warming air be beneficial to gas exchange? - CORRECT ANSWER It would expand the air
to make it more available for gas exchange."
"In gas exchange (external respiration) : - CORRECT ANSWER Oxygen diffuses from alveoli into
capillaries, carbon dioxide diffuses from capillaries into alveoli."
“How many lobes does the right human lung have? - CORRECT ANSWER three lobes"
"Air and food pass through which area? - CORRECT ANSWER Oropharynx"
"Rings of cartilage line much of the respiratory tract. In which of the following can cartilage NOT be
found? - CORRECT ANSWER Trachea
Larynx
Bronchi
Alveoli
(Alveoli)"
"Label B
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