Nokea
Which of these factors does not affect hemoglobin's affinity for oxygen?
- A. RBC metabolic activity
- B. temperature
- C. electrolyte balance
- D. the PO2 of blood
Correct Answer: C
Rationale: The correct answer is C: electrolyte balance. Hemoglobin's affinity for oxygen is primarily influenced by factors such as pH, temperature, and the partial pressure of oxygen (PO2). Electrolyte balance, on the other hand, does not directly impact hemoglobin's ability to bind with oxygen. Changes in electrolyte levels may affect overall blood composition but do not directly alter hemoglobin's oxygen-binding capacity. Therefore, electrolyte balance does not affect hemoglobin's affinity for oxygen, making it the correct choice. RBC metabolic activity can impact oxygen release from hemoglobin, temperature can affect hemoglobin's oxygen-binding capacity, and the PO2 of blood directly influences oxygen binding to hemoglobin.
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The obstructive lung disease in which connective tissues are lost, alveolar surfaces are damaged, and the respiratory surface is reduced is called
- A. asthma
- B. bronchitis
- C. emphysema
- D. tuberculosis
Correct Answer: C
Rationale: Emphysema is the correct answer because it is characterized by the destruction of alveolar walls and connective tissues in the lungs, leading to reduced respiratory surface area. Asthma is characterized by airway inflammation and bronchoconstriction. Bronchitis is inflammation of the bronchial tubes. Tuberculosis is a bacterial infection affecting the lungs. Emphysema best fits the description provided in the question.
The nurse is developing a teaching plan for a 64-year-old client with coronary artery disease (CAD). Which factor should the nurse focus on during the teaching session?
- A. Family history of coronary artery disease
- B. Elevated low-density lipoprotein (LDL) level
- C. Greater risk associated with the patient's gender
- D. Increased risk of cardiovascular disease with aging
Correct Answer: B
Rationale: The correct answer is B: Elevated low-density lipoprotein (LDL) level. This is the most relevant factor to focus on during the teaching session for a client with CAD. Elevated LDL levels are a major risk factor for the development and progression of CAD. By addressing this factor, the nurse can educate the client on the importance of managing cholesterol levels through diet, exercise, and medication.
Incorrect choices:
A: Family history of CAD - While family history is a risk factor, it cannot be modified through education alone.
C: Greater risk associated with the patient's gender - Gender is a non-modifiable risk factor and not the primary focus for teaching.
D: Increased risk of cardiovascular disease with aging - While age is a risk factor, the focus should be on modifiable risk factors like LDL levels.
Which of the following statements is false?
- A. Hemoglobin functions as a buffer
- B. Bicarbonate ions tend to diffuse out of red blood cells into the blood plasma.
- C. The movement of molecules is in different directions in the metabolically active tissues and the alveoli.
- D. Carbonic anhydrase is an enzyme that promotes the formation of oxyhemoglobin.
Correct Answer: D
Rationale: The correct answer is D because carbonic anhydrase catalyzes the conversion of carbon dioxide and water into bicarbonate ions and protons, not the formation of oxyhemoglobin. Step-by-step rationale: 1. Hemoglobin functions as a buffer by binding to hydrogen ions to help regulate pH levels in the blood. 2. Bicarbonate ions do tend to diffuse out of red blood cells into the plasma to maintain the balance of CO2 and pH. 3. The movement of molecules is indeed different in metabolically active tissues (where oxygen is released and CO2 is taken up) compared to the alveoli (where the opposite occurs). Therefore, choices A, B, and C are all correct statements, making D the false statement.
TB skin test is called 'Scatch test or Mantoux test' in which Tuberculin Purified Protein Derivative (PPD) is injected subcutaneously. This test is based on
- A. Delayed Hypersensitivity
- B. Production of antibodies
- C. Production of Tubercle toxin
- D. All these
Correct Answer: A
Rationale: The correct answer is A: Delayed Hypersensitivity. The TB skin test, also known as the Mantoux test, is based on the principle of delayed hypersensitivity reaction. When Tuberculin Purified Protein Derivative (PPD) is injected subcutaneously, in individuals previously exposed to TB, the immune system mounts a delayed hypersensitivity reaction resulting in localized inflammation at the injection site. This reaction is mediated by T cells and is indicative of previous exposure to the TB bacterium.
Incorrect choices:
B: Production of antibodies - The TB skin test does not detect the production of antibodies specific to TB, but rather the cellular immune response.
C: Production of Tubercle toxin - The test is not based on the production of the tubercle toxin, but on the immune response to the tuberculin PPD.
D: All these - While the immune response may involve various components, such as antibodies and cellular responses, the primary basis of the TB skin test is the
Inflammation of the lungs covering causing severe chest pain is
- A. Emphysema
- B. Pleurisy
- C. Asphyxia
- D. Hypoxia
Correct Answer: B
Rationale: The correct answer is B: Pleurisy. Pleurisy is inflammation of the pleura, the lining around the lungs, causing severe chest pain. Emphysema (A) is a chronic lung condition causing shortness of breath, not chest pain. Asphyxia (C) is a condition of insufficient oxygen, not related to lung inflammation. Hypoxia (D) is low oxygen levels in tissues, not specific to lung covering inflammation. Pleurisy is the only choice directly related to inflammation of the lungs' covering, making it the correct answer.