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NU551 Unit 7 Questions and Correct
Answers/ Latest Update / Already Graded
What causes cyanosis and how much hemoglobin must be
desaturated?
Ans: Bluish-purple discoloration due to ~5 g/dL of desaturated
hemoglobin
Where is cyanosis most visible?
Ans: Lips, nail beds, earlobes (thin-skin areas)
What is clubbing and what is it associated with?
Ans: Bulbous enlargement of fingertips/toes from chronic low
oxygen; linked to COPD, cystic fibrosis, congenital heart
disease, smokers, vapers
What is the pleura?
Ans: Two-layer membrane around lungs with a fluid-filled
cavity between
What is pleurisy and its main cause?
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Ans: Inflammation of pleura (usually viral) → sharp chest pain
worse with breathing/coughing
Key clinical signs of pleurisy?
Ans: Left-sided chest pain, shallow breathing, increased
HR/RR, normal breath sounds, no cyanosis
What is hypercapnia?
Ans: Excess CO₂ in the blood (common in COPD)
What is hypoxia?
Ans: Low oxygen in tissues; requires ABG interpretation (pH,
CO₂, HCO₃⁻)
What are the 5 causes of hypoxia?
Ans: High altitude, diffusion problems, V/Q mismatch,
hypoventilation, shunt
What is flail chest?
Ans: Rib/sternal fractures causing paradoxical chest wall
movement
All rights reserved © 2025/ 2026 |
NU551 Unit 7 Questions and Correct
Answers/ Latest Update / Already Graded
What causes cyanosis and how much hemoglobin must be
desaturated?
Ans: Bluish-purple discoloration due to ~5 g/dL of desaturated
hemoglobin
Where is cyanosis most visible?
Ans: Lips, nail beds, earlobes (thin-skin areas)
What is clubbing and what is it associated with?
Ans: Bulbous enlargement of fingertips/toes from chronic low
oxygen; linked to COPD, cystic fibrosis, congenital heart
disease, smokers, vapers
What is the pleura?
Ans: Two-layer membrane around lungs with a fluid-filled
cavity between
What is pleurisy and its main cause?
All rights reserved © 2025/ 2026 |
, Page |2
Ans: Inflammation of pleura (usually viral) → sharp chest pain
worse with breathing/coughing
Key clinical signs of pleurisy?
Ans: Left-sided chest pain, shallow breathing, increased
HR/RR, normal breath sounds, no cyanosis
What is hypercapnia?
Ans: Excess CO₂ in the blood (common in COPD)
What is hypoxia?
Ans: Low oxygen in tissues; requires ABG interpretation (pH,
CO₂, HCO₃⁻)
What are the 5 causes of hypoxia?
Ans: High altitude, diffusion problems, V/Q mismatch,
hypoventilation, shunt
What is flail chest?
Ans: Rib/sternal fractures causing paradoxical chest wall
movement
All rights reserved © 2025/ 2026 |
