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NU551 Unit 7 Questions and Correct Answers/ Latest Update / Already Graded

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NU551 Unit 7 Questions and Correct Answers/ Latest Update / Already Graded

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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?


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 |

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