NUR 242
NUR 242 MED SURG EXAM 3 2026 NEWEST LATEST ACTUAL
EXAM 250 QUESTIONS AND CORRECT DETAILED ANSWERS
What is ventilation? - correct answer the movement of air into
and out of the lungs
What is perfusion? - correct answer the circulation of blood
through the lungs
What are central chemoreceptors responsive to? - correct
answer increased H+ in the brain ECF;
increased PaCO2;
"hypercarbic drive"
,NUR 242
What are peripheral chemoreceptors responsive to? -
correct answer decreased pH;
increased PaCO2;
decreased PaO2;
"hypoxic drive"
What are elastic forces? - correct answer lungs recoil due to
elastin, collagen, fibrin
What are surface forces? - correct answer surface tension due
to water-air interface
What is airway resistance? - correct answer opposition to flow
caused by the forces of friction; primarily determined by
airway radius
What is the distensibility of the lungs? - correct answer ease
with which the lungs can be inflated
,NUR 242
What is lung distensibility increased in? - correct answer
neonates and children;
emphysema
What is lung distensibility decreased in? - correct answer
elderly;
pneumonia, pulmonary edema, ARDS, atelectasis, fibrosis
What is surfactant? - correct answer complex substance lining
the alveoli and smallest bronchioles containing
phospholipids and a number of apoproteins which
reduces surface tension throughout the lungs, thereby
contributing to its general compliance;
stabilizes the alveoli and keeps them dry
What produces surfactant? - correct answer produced by the
Type II alveolar cells
What is Ohm's law? - correct answer velocity = driving
force/resistance
, NUR 242
What is Poiseuille law? - correct answer resistance = (8 x
viscosity x length) / (pi x radius^4)
What happens if the radius in the lungs goes down? -
correct answer the resistance goes up
How is the ventilation distributed in the lungs? - correct
answer the top of the lungs are more distended and less
compliant whereas the lower lung is small and highly
compliant
What factors affect lung perfusion? - correct answer lung
capacitance;
low resistance system;
flow influenced by gravity;
resistance primarily determined by vessel radius
What does hypoxia lead to? - correct answer vasoconstriction
of pulmonary vessels
NUR 242 MED SURG EXAM 3 2026 NEWEST LATEST ACTUAL
EXAM 250 QUESTIONS AND CORRECT DETAILED ANSWERS
What is ventilation? - correct answer the movement of air into
and out of the lungs
What is perfusion? - correct answer the circulation of blood
through the lungs
What are central chemoreceptors responsive to? - correct
answer increased H+ in the brain ECF;
increased PaCO2;
"hypercarbic drive"
,NUR 242
What are peripheral chemoreceptors responsive to? -
correct answer decreased pH;
increased PaCO2;
decreased PaO2;
"hypoxic drive"
What are elastic forces? - correct answer lungs recoil due to
elastin, collagen, fibrin
What are surface forces? - correct answer surface tension due
to water-air interface
What is airway resistance? - correct answer opposition to flow
caused by the forces of friction; primarily determined by
airway radius
What is the distensibility of the lungs? - correct answer ease
with which the lungs can be inflated
,NUR 242
What is lung distensibility increased in? - correct answer
neonates and children;
emphysema
What is lung distensibility decreased in? - correct answer
elderly;
pneumonia, pulmonary edema, ARDS, atelectasis, fibrosis
What is surfactant? - correct answer complex substance lining
the alveoli and smallest bronchioles containing
phospholipids and a number of apoproteins which
reduces surface tension throughout the lungs, thereby
contributing to its general compliance;
stabilizes the alveoli and keeps them dry
What produces surfactant? - correct answer produced by the
Type II alveolar cells
What is Ohm's law? - correct answer velocity = driving
force/resistance
, NUR 242
What is Poiseuille law? - correct answer resistance = (8 x
viscosity x length) / (pi x radius^4)
What happens if the radius in the lungs goes down? -
correct answer the resistance goes up
How is the ventilation distributed in the lungs? - correct
answer the top of the lungs are more distended and less
compliant whereas the lower lung is small and highly
compliant
What factors affect lung perfusion? - correct answer lung
capacitance;
low resistance system;
flow influenced by gravity;
resistance primarily determined by vessel radius
What does hypoxia lead to? - correct answer vasoconstriction
of pulmonary vessels
