ATI LPN
Questions for the Respiratory System Questions
Question 1 of 5
The thickest layer of tissue in the heart wall is the:
Correct Answer: C
Rationale: The myocardium, the heart wall's thickest layer, is cardiac muscle driving contraction thickest in the left ventricle (~1-1.5 cm) for systemic pressure. Epicardium and endocardium are thin connective layers; pericardium is the sac, not wall. This muscle bulk powers pumping, key in hypertrophy or infarction where it's affected, a core structural feature in cardiac function.
Question 2 of 5
What intervention should the nurse identify as the priority for the client with a nursing diagnosis of Ineffective Airway Clearance related to tumor mass?
Correct Answer: C
Rationale: Coughing, deep breathing, and hydration (C) are priority for airway clearance with a tumor mass, per document (3). Cough expels mucus (e.g., 50 mL/day), breathing opens airways, and fluids (2-3 L) thin secretions. Oâ‚‚ (A) treats hypoxemia, not clearance. Elevation (B) aids breathing, not obstruction. Tracheostomy (D) is last-resort. C's active clearance boosting tidal volume (500 mL) targets tumor blockage, unlike A's support or D's invasiveness.
Question 3 of 5
A child with laryngotracheobronchitis (LTB) is being treated in the ED. What should the nurse plan to do to ease resp. distress? Select all that apply.
Correct Answer: A
Rationale: High-Fowler's (A), racemic epinephrine (B), corticosteroids (C), and calm parents ease LTB distress, per document (1). A (60-90°) reduces airway edema pressure (e.g., 10 mmHg drop). Epinephrine shrinks swelling (5-10 min onset). Steroids cut inflammation. Antibiotics (D) are viral-irrelevant. A's positioning RR drop 20% is priority, distinguishing it from D's misuse in croup's viral etiology.
Question 4 of 5
The nurse anticipates using postural drainage as a treatment modality for which of the following conditions?
Correct Answer: C
Rationale: Cystic fibrosis (CF) uses postural drainage (C), per document (3). Thick mucus (CFTR defect) needs percussion (50 mL/day cleared), improving V/Q. Epiglottitis (A) risks airway closure drainage contraindicated. Aspiration (B) needs removal, not drainage. BPD (D) uses it less. C's mucus burden FEVâ‚ <60% makes it key, unlike A's swelling.
Question 5 of 5
As blood enters the systemic capillaries
Correct Answer: B
Rationale: As blood enters systemic capillaries, P_O2 in blood (~100 mmHg, oxygenated from lungs) is higher than in tissues (~40 mmHg or less, due to cellular use), driving Oâ‚‚ diffusion into cells (internal respiration). Tissue P_CO2 (~45 mmHg) exceeds blood (~40 mmHg), moving COâ‚‚ into capillaries. Equal P_O2 (D) or P_O2 matching P_CO2 (A) would stop exchange; lower blood P_O2 (C) reverses reality. This gradient ensures Oâ‚‚ delivery and COâ‚‚ pickup, a key step in systemic circulation, critical for metabolism and conditions like hypoxia where tissue Oâ‚‚ falls, reflecting capillary-tissue dynamics.