NUR 242 MED SURG EXAM 3 2025 NEWEST
LATEST ACTUAL EXAM 250 QUESTIONS
AND CORRECT DETAILED ANSWERS WITH
RATIONALES|ALREADY GRADED
A+||GALEN COLLEGE OF NURSING
1. What is ventilation? ANS the movement of air into and out of the lungs
2. What is perfusion? ANS the circulation of blood through the lungs
,3. What are central chemoreceptors responsive to? ANS increased H+ in the
brain ECF;
increased PaCO2;
"hypercarbic drive"
4. What are peripheral chemoreceptors responsive to? ANS
decreased pH; increased PaCO2;
decreased PaO2;
"hypoxic drive"
5. What are elastic forces? ANS lungs recoil due to elastin, collagen, fibrin
6. What are surface forces? ANS surface tension due to water-air interface
7. What is airway resistance? ANS opposition to flow caused by the forces of
friction; primarily determined by airway radius
8. What is the distensibility of the lungs? ANS ease with which the lungs
can be inflated
9. What is lung distensibility increased in? ANS neonates and
children; emphysema
10. What is lung distensibility decreased in? ANS
elderly; pneumonia, pulmonary edema, ARDS, atelectasis,
fibrosis
,11. What is surfactant? ANS complex substance lining the alveoli and smallest
bronchi- oles 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
12. What produces surfactant? ANS produced by the Type II alveolar cells
13. What is Ohm's law? ANS velocity = driving force/resistance
14. What is Poiseuille law? ANS resistance = (8 x viscosity x length) / (pi x
radius^4)
15. What happens if the radius in the lungs goes down? ANS the resistance goe
up
16. How is the ventilation distributed in the lungs? ANS the top of the lungs are
more distended and less compliant whereas the lower lung is small and highly
compliant
17. What factors affect lung perfusion? ANS lung
capacitance; low resistance system;
flow influenced by gravity;
resistance primarily determined by vessel radius
18. What does hypoxia lead to? ANS vasoconstriction of pulmonary vessels
, 19. What does prolonged hypoxia lead to? ANS pulmonary hypertension
LATEST ACTUAL EXAM 250 QUESTIONS
AND CORRECT DETAILED ANSWERS WITH
RATIONALES|ALREADY GRADED
A+||GALEN COLLEGE OF NURSING
1. What is ventilation? ANS the movement of air into and out of the lungs
2. What is perfusion? ANS the circulation of blood through the lungs
,3. What are central chemoreceptors responsive to? ANS increased H+ in the
brain ECF;
increased PaCO2;
"hypercarbic drive"
4. What are peripheral chemoreceptors responsive to? ANS
decreased pH; increased PaCO2;
decreased PaO2;
"hypoxic drive"
5. What are elastic forces? ANS lungs recoil due to elastin, collagen, fibrin
6. What are surface forces? ANS surface tension due to water-air interface
7. What is airway resistance? ANS opposition to flow caused by the forces of
friction; primarily determined by airway radius
8. What is the distensibility of the lungs? ANS ease with which the lungs
can be inflated
9. What is lung distensibility increased in? ANS neonates and
children; emphysema
10. What is lung distensibility decreased in? ANS
elderly; pneumonia, pulmonary edema, ARDS, atelectasis,
fibrosis
,11. What is surfactant? ANS complex substance lining the alveoli and smallest
bronchi- oles 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
12. What produces surfactant? ANS produced by the Type II alveolar cells
13. What is Ohm's law? ANS velocity = driving force/resistance
14. What is Poiseuille law? ANS resistance = (8 x viscosity x length) / (pi x
radius^4)
15. What happens if the radius in the lungs goes down? ANS the resistance goe
up
16. How is the ventilation distributed in the lungs? ANS the top of the lungs are
more distended and less compliant whereas the lower lung is small and highly
compliant
17. What factors affect lung perfusion? ANS lung
capacitance; low resistance system;
flow influenced by gravity;
resistance primarily determined by vessel radius
18. What does hypoxia lead to? ANS vasoconstriction of pulmonary vessels
, 19. What does prolonged hypoxia lead to? ANS pulmonary hypertension
