WGU D236 Pathophysiology Final Exam – Advanced Respiratory
System ,Silicosis and Occupational Lung Disease, Berylliosis
(Granulomatous Interstitial Pneumonitis), Emphysema
Pathophysiology (Alveolar Destruction, Air Trapping,
Hyperinflation), COPD Clinical Manifestations, Chronic Bronchitis vs
Emphysema (Blue Bloater vs Pink Puffer), Dyspnea Types
(Orthopnea, Paroxysmal Nocturnal Dyspnea), Abnormal Breathing
Patterns (Kussmaul and Cheyne-Stokes Respirations), Gas Exchange
Disorders (Hypoxemia vs Hypoxia, Hypercapnia), Pulmonary
Function Changes, Radiographic Findings (Flattened Diaphragm,
Barrel Chest), and Exam Practice Questions Verified and Provided
with Complete A+ Graded Answers Latest Updated 2026
Silicosis Pathophysiology
Progressive lung disease caused by long-term inhalation of silica dust, leading to chronic lung
inflammation and nodular fibrosis. [Respiratory System]
Silicosis Occupational Link
Classically associated with workers performing sandblasting operations ('guy with
sandblaster'). [Respiratory System]
Berylliosis Definition
Occupational lung disease characterized by immune-mediated granuloma formation and
diffuse interstitial pneumonitis due to beryllium exposure. [Respiratory System]
,Berylliosis History
Associated with history of exposure to nuclear power plants or aerospace manufacturing
industries. [Respiratory System]
Berylliosis Manifestations
presents with nasal ulcers, dry cough, progressive shortness of breath, and significant weight
loss. [Respiratory System]
Emphysema Pathophysiology
Free radical and elastase damage to endothelial/epithelial cells destroys alveolar walls
without obvious fibrosis, causing loss of elastic recoil. [Respiratory System]
Emphysema Air Trapping
Alveoli lose their elastic outlines, rupture, and merge into large air spaces, leading to chronic
air trapping and hyperinflation. [Respiratory System]
Pink Puffer Appearance
Skin appears pink because patients manage to maintain oxygenation status through
compensatory hyperventilation until late stages. [Respiratory System]
Purse-lipped breathing rationale
,Done to create backpressure in the airways, preventing compensatory alveolar collapse
during expiration. [Respiratory System]
Emphysema Frame/Weight
Thin, cachectic frame caused by high caloric expenditure driven by the massive metabolic
workload of breathing. [Respiratory System]
Barrel Chest Cause
Chronic air trapping overinflates the lungs and increases the anterior-posterior chest wall
diameter over time. [Respiratory System]
Emphysema X-ray Finding
Shows a characteristically flattened diaphragm due to chronic pulmonary hyperinflation.
[Respiratory System]
COPD Key Signs
Progressive dyspnea (shortness of breath) and audible expiratory wheezing during
assessment. [Respiratory System]
Chronic Bronchitis Definition
Hypersecretion of mucus and chronic productive cough that lasts for at least 3 months of the
year for 2 consecutive years. [Respiratory System]
, Blue Bloater Appearance
Cyanosis and fluid retention (edema) from right-sided heart failure secondary to chronic
hypoxemia. [Respiratory System]
Dyspnea
Subjective sensation of uncomfortable breathing or shortness of breath. [Respiratory System]
Orthopnea
Dyspnea that occurs when an individual lies flat, common in heart failure and advanced lung
diseases. [Respiratory System]
Paroxysmal Nocturnal Dyspnea
Sudden awakening at night with severe dyspnea, forcing the patient to sit or stand to breathe.
[Respiratory System]
Kussmaul Respiration
Deep, rapid breathing pattern often observed in patients with severe metabolic acidosis (like
DKA) to expel carbon dioxide. [Respiratory System]
Cheyne-Stokes Respiration
Alternating periods of deep and shallow breathing with staccato periods of apnea, indicating
brainstem ischemia or advanced heart failure. [Respiratory System]
System ,Silicosis and Occupational Lung Disease, Berylliosis
(Granulomatous Interstitial Pneumonitis), Emphysema
Pathophysiology (Alveolar Destruction, Air Trapping,
Hyperinflation), COPD Clinical Manifestations, Chronic Bronchitis vs
Emphysema (Blue Bloater vs Pink Puffer), Dyspnea Types
(Orthopnea, Paroxysmal Nocturnal Dyspnea), Abnormal Breathing
Patterns (Kussmaul and Cheyne-Stokes Respirations), Gas Exchange
Disorders (Hypoxemia vs Hypoxia, Hypercapnia), Pulmonary
Function Changes, Radiographic Findings (Flattened Diaphragm,
Barrel Chest), and Exam Practice Questions Verified and Provided
with Complete A+ Graded Answers Latest Updated 2026
Silicosis Pathophysiology
Progressive lung disease caused by long-term inhalation of silica dust, leading to chronic lung
inflammation and nodular fibrosis. [Respiratory System]
Silicosis Occupational Link
Classically associated with workers performing sandblasting operations ('guy with
sandblaster'). [Respiratory System]
Berylliosis Definition
Occupational lung disease characterized by immune-mediated granuloma formation and
diffuse interstitial pneumonitis due to beryllium exposure. [Respiratory System]
,Berylliosis History
Associated with history of exposure to nuclear power plants or aerospace manufacturing
industries. [Respiratory System]
Berylliosis Manifestations
presents with nasal ulcers, dry cough, progressive shortness of breath, and significant weight
loss. [Respiratory System]
Emphysema Pathophysiology
Free radical and elastase damage to endothelial/epithelial cells destroys alveolar walls
without obvious fibrosis, causing loss of elastic recoil. [Respiratory System]
Emphysema Air Trapping
Alveoli lose their elastic outlines, rupture, and merge into large air spaces, leading to chronic
air trapping and hyperinflation. [Respiratory System]
Pink Puffer Appearance
Skin appears pink because patients manage to maintain oxygenation status through
compensatory hyperventilation until late stages. [Respiratory System]
Purse-lipped breathing rationale
,Done to create backpressure in the airways, preventing compensatory alveolar collapse
during expiration. [Respiratory System]
Emphysema Frame/Weight
Thin, cachectic frame caused by high caloric expenditure driven by the massive metabolic
workload of breathing. [Respiratory System]
Barrel Chest Cause
Chronic air trapping overinflates the lungs and increases the anterior-posterior chest wall
diameter over time. [Respiratory System]
Emphysema X-ray Finding
Shows a characteristically flattened diaphragm due to chronic pulmonary hyperinflation.
[Respiratory System]
COPD Key Signs
Progressive dyspnea (shortness of breath) and audible expiratory wheezing during
assessment. [Respiratory System]
Chronic Bronchitis Definition
Hypersecretion of mucus and chronic productive cough that lasts for at least 3 months of the
year for 2 consecutive years. [Respiratory System]
, Blue Bloater Appearance
Cyanosis and fluid retention (edema) from right-sided heart failure secondary to chronic
hypoxemia. [Respiratory System]
Dyspnea
Subjective sensation of uncomfortable breathing or shortness of breath. [Respiratory System]
Orthopnea
Dyspnea that occurs when an individual lies flat, common in heart failure and advanced lung
diseases. [Respiratory System]
Paroxysmal Nocturnal Dyspnea
Sudden awakening at night with severe dyspnea, forcing the patient to sit or stand to breathe.
[Respiratory System]
Kussmaul Respiration
Deep, rapid breathing pattern often observed in patients with severe metabolic acidosis (like
DKA) to expel carbon dioxide. [Respiratory System]
Cheyne-Stokes Respiration
Alternating periods of deep and shallow breathing with staccato periods of apnea, indicating
brainstem ischemia or advanced heart failure. [Respiratory System]
