Nokea
The nurse is caring for a patient with advanced emphysema. Which sign isn't manifestations of this disorder?
- A. Productive cough
- B. Dyspnea
- C. Barrel chest
- D. Wheezing
Correct Answer: D
Rationale: The correct answer is D: Wheezing. Emphysema is characterized by destruction of lung tissue, leading to air trapping and decreased airflow. Wheezing is typically associated with asthma or bronchitis, not emphysema. A: Productive cough is common in emphysema due to increased mucus production. B: Dyspnea (shortness of breath) is a hallmark symptom of emphysema due to impaired gas exchange. C: Barrel chest is a physical finding in emphysema caused by hyperinflation of the lungs.
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The partial pressure of oxygen in the interstitial space of peripheral tissues is approximately
- A. 40 mm Hg
- B. 45 mm Hg
- C. 50 mm Hg
- D. 70 mm Hg
Correct Answer: A
Rationale: The correct answer is A: 40 mm Hg. In peripheral tissues, oxygen is delivered by the blood through capillaries. The partial pressure of oxygen in the interstitial space of peripheral tissues is lower than in the blood, around 40 mm Hg. This allows for the diffusion of oxygen from capillaries to cells. Choice B (45 mm Hg) and C (50 mm Hg) are slightly higher pressures and would not promote efficient oxygen diffusion. Choice D (70 mm Hg) is closer to arterial blood oxygen levels and would not allow sufficient oxygen release to tissues. Thus, the correct answer is A as it reflects the physiological conditions necessary for effective oxygen delivery to cells.
The volume of air that can be exhaled after normal exhalation is the
- A. tidal volume
- B. residual volume
- C. inspiratory reserve volume
- D. expiratory reserve volume
Correct Answer: D
Rationale: The correct answer is D: expiratory reserve volume. After normal exhalation (tidal volume), the expiratory reserve volume represents the additional volume of air that can be forcefully exhaled. This volume is used during activities requiring increased breathing effort. Choices A and C are incorrect because tidal volume is the volume of air inhaled or exhaled during normal breathing, and inspiratory reserve volume is the extra volume of air that can be inhaled after a normal inhalation. Choice B, residual volume, is the volume of air remaining in the lungs after maximal exhalation and cannot be exhaled voluntarily.
The Pseudostratified ciliated columnar epithelium lining the trachea is composed of
- A. Goblet cells
- B. Macrophages
- C. Fibroblast
- D. All these
Correct Answer: A
Rationale: The correct answer is A: Goblet cells. Goblet cells are responsible for secreting mucus in the respiratory tract, aiding in trapping and removing foreign particles. This is crucial for protecting the lungs from debris and pathogens. Macrophages are immune cells that engulf and digest pathogens, not a component of the epithelium. Fibroblasts are connective tissue cells, not part of the epithelial lining. Therefore, the correct answer is A.
Which form of epithelial tissue may be found in the upper respiratory system (URS)?
- A. pseudostratified ciliated columnar epithelium.
- B. moist cuboidal epithelium.
- C. simple squamous epithelium.
- D. stratified squamous epithelium.
Correct Answer: A
Rationale: Step 1: The upper respiratory system requires protection and mucus secretion.
Step 2: Pseudostratified epithelium provides protection and has cilia for moving mucus.
Step 3: Ciliated columnar cells help sweep mucus and debris out of the respiratory tract.
Step 4: Therefore, pseudostratified ciliated columnar epithelium is the correct choice.
Summary:
B: Moist cuboidal epithelium lacks cilia and isn't specialized for mucus clearance.
C: Simple squamous epithelium is too thin and fragile for protection.
D: Stratified squamous epithelium is more suited for areas with high mechanical stress.
The lungs move easily within their protective sacs due to
- A. intrapleural fluid.
- B. leaking plasma.
- C. blood.
- D. mucus.
Correct Answer: A
Rationale: The correct answer is A: intrapleural fluid. Intrapleural fluid reduces friction between the lungs and the chest wall, allowing them to move easily during breathing. This fluid creates a lubricated surface that facilitates smooth movement. Leaking plasma (B) and mucus (D) do not provide the necessary lubrication for lung movement. Blood (C) plays a role in oxygen exchange but does not directly contribute to the ease of lung movement within the pleural sacs.