Nokea
A sensitized B cell is activated once:
- A. it binds a helper T cell that releases cytokines.
- B. it binds a cytotoxic T cell.
- C. memory B cells have been cloned.
- D. it has cloned plasma cells.
Correct Answer: A
Rationale: The correct answer is A because a sensitized B cell requires activation by a helper T cell releasing cytokines to undergo differentiation and proliferation into plasma cells. This interaction is crucial for initiating the humoral immune response. Choices B, C, and D are incorrect because binding to a cytotoxic T cell, cloning of memory B cells, or cloning of plasma cells do not directly activate a sensitized B cell for its function in producing antibodies.
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How many layers of pleura have
- A. 2
- B. visceral
- C. Parietal
- D. all of the above
Correct Answer: A
Rationale: Step 1: Pleura is a thin membrane that surrounds the lungs and lines the chest cavity.
Step 2: There are two layers of pleura - visceral (inner layer covering the lungs) and parietal (outer layer lining the chest cavity).
Step 3: The correct answer is A (2), because there are only two layers of pleura.
Summary: Choice B and C are incorrect because they each represent only one layer of pleura, whereas the correct answer A encompasses both layers. Choice D is incorrect because it includes all options, which is not accurate in this case.
Priority Decision: To reduce the risk for most occupational lung diseases, what is the most important measure the occupational nurse should promote?
- A. Maintaining smoke-free work environments for all employees.
- B. Using masks and effective ventilation systems to reduce exposure to irritants.
- C. Inspection and monitoring of workplaces by national occupational safety agencies.
- D. Requiring periodic chest x-rays and pulmonary function tests for exposed employees.
Correct Answer: D
Rationale: Requiring periodic chest x-rays and pulmonary function tests for exposed employees is crucial in early detection and prevention of occupational lung diseases.
The nurse supervises unlicensed assistive personnel (UAP) providing care for a client who has right lower lobe pneumonia. Which action by the UAP requires the nurse to intervene?
- A. UAP assists the client to ambulate to the bathroom.
- B. UAP helps splint the client's chest during coughing.
- C. UAP transfers the client to a bedside chair for meals.
- D. UAP lowers the head of the client's bed to 15 degrees
Correct Answer: D
Rationale: Correct Answer: D
Rationale:
1. In right lower lobe pneumonia, positioning the client with the affected side down helps improve ventilation and drainage.
2. Lowering the head of the bed to 15 degrees promotes pooling of secretions, worsening respiratory status.
3. A, B, and C are appropriate actions that promote client comfort and safety in pneumonia management.
4. Intervening in option D is crucial to prevent complications and promote effective respiratory care.
An assistive personnel (AP) was feeding a client with a tracheostomy. Later that evening the UAP reports that the client had a coughing spell during the meal. What action by the nurse is best?
- A. Assess the client's lung sounds.
- B. Assign a different AP to the client.
- C. Report the AP to the manager.
- D. Request thicker liquids for meals.
Correct Answer: A
Rationale: Correct Answer: A - Assess the client's lung sounds.
Rationale:
1. Assessing lung sounds helps determine if the client is experiencing respiratory distress.
2. Coughing during a meal with a tracheostomy can indicate aspiration or airway obstruction.
3. Prompt assessment can prevent potential complications and guide further interventions.
Summary:
- B: Assigning a different AP does not address the client's immediate respiratory status.
- C: Reporting the AP to the manager is not necessary before assessing the client's condition.
- D: Requesting thicker liquids does not address the underlying issue of potential aspiration or airway obstruction.
A patient has been diagnosed with pulmonary hypertension, in which the capillaries in the alveoli are squeezed excessively. The nurse should recognize a disturbance in what aspect of normal respiratory function?
- A. Acid-base balance
- B. Perfusion
- C. Diffusion
- D. Ventilation
Correct Answer: B
Rationale: The correct answer is B: Perfusion. Pulmonary hypertension affects blood flow through the lungs, leading to decreased perfusion. This results in inadequate oxygenation of the blood. Acid-base balance (A) is maintained by the kidneys and lungs, not directly impacted by pulmonary hypertension. Diffusion (C) refers to gas exchange in the alveoli, which is affected by perfusion but not the primary disturbance in pulmonary hypertension. Ventilation (D) is the process of moving air in and out of the lungs, which is not primarily affected by pulmonary hypertension; it is more related to conditions like COPD.