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BIO 431 - Unit 2 Lecture Exam Questions with Verified Answers
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BIO 431 - Unit 2 Lecture Exam Questions with Verified Answers
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BIO 431 - Unit 2 Lecture Exam Questionswith Verified Answers
Conducting zone function: - Answer-modify air prior to gas exchange by cleaning,
humidifying and adjusting the temperature of air
Respiratory zone function: - Answer-Gas exchange
Type 1 alveolar cell function: - Answer-line alveolus and participate in gas exchange
What kind of ET is type 1 alveolar cell: - Answer-simple squamous ET
Type 2 alveolar cell function: - Answer-produce surfactant and prevents alveoli from
collapsing
What kind of ET is type 2 alveolar cell: - Answer-cuboidal ET
Why are pleura required for pulmonary ventilation? - Answer--reduces friction
-Expansion of the thoracic wall will cause expansion of lung tissue
Intrapleural pressure (Pip):
-pressure gradient: - Answer--pressure in pleural cavity; fluctuates with breathing
-Always a negative pressure (-4 -> -6 -> -4 etc. )
Intrapulmonary pressure (Palv):
-pressure gradient: - Answer--pressure in alveoli; fluctuates with breathing
-always equalizes with atmospheric pressure
How does intrapleural pressure compare to intrapulmonary pressure? - Answer-
intrapleural pressure is always negative since it acts as a suction to keep lungs inflated
What causes quiet inspiration: - Answer--Inspiratory muscles contract causing an
increase in thoracic and lung volume
-Palv is below Patm, which causes the P gradient to follow airflow from higher to lower
concentrations
-Inspiration until Palv = Patm
Quiet inspiration is an _________________ process - Answer-active
What causes Forced inspiration: - Answer--The body recruits more motor units in
inspiratory muscles and accessory muscles to have a larger increase in thoracic and
lung volume.
-Palv becomes more negative (-3mmHg) which causes the air to follow the P gradient
that forces air into the lungs via P gradient until Palv = Patm
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