Nokea
Which of the following are risk factors of laryngeal cancer?
- A. Acute laryngitis
- B. Tobacco use
- C. Caffeine use
- D. Sleep apnea
Correct Answer: B
Rationale: The correct answer is B. Tobacco use is a well-established risk factor for laryngeal cancer. A (acute laryngitis) is a temporary condition and not a risk factor. C (caffeine use) has no proven link to laryngeal cancer. D (sleep apnea) is unrelated.
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Which metal ion is often present in the active site of carbonic anhydrase enzymes?
- A. Iron (Fe)
- B. Calcium (Ca)
- C. Zinc (Zn)
- D. Magnesium (Mg)
Correct Answer: C
Rationale: The correct answer is C: Zinc (Zn). Zinc is often present in the active site of carbonic anhydrase enzymes because it plays a crucial role in catalyzing the conversion of carbon dioxide to bicarbonate and protons. Zinc ions have the appropriate coordination geometry and charge to facilitate this reaction efficiently. Iron (Fe) is not typically found in the active site of carbonic anhydrase enzymes. Calcium (Ca) and Magnesium (Mg) do not have the appropriate properties to serve as the catalytic metal ion in this enzyme. Therefore, zinc (Zn) is the correct answer due to its specific role and properties in the catalytic mechanism of carbonic anhydrase enzymes.
The nurse is assessing a patient with chronic obstructive pulmonary disease (COPD). Which assessment finding indicates a potential complication and requires the nurse's immediate attention?
- A. Distended neck veins
- B. Left lower quadrant tenderness
- C. Urinary output of 40 mL/hr
- D. Excessive coughing
Correct Answer: A
Rationale: The correct answer is A: Distended neck veins. This finding indicates potential right-sided heart failure, a complication of COPD called cor pulmonale. The nurse should address this immediately to prevent further deterioration. Distended neck veins suggest increased central venous pressure and impaired right heart function. Left lower quadrant tenderness (B) is unrelated to COPD. Urinary output of 40 mL/hr (C) is within normal range. Excessive coughing (D) is a common symptom of COPD but does not indicate an immediate complication.
A nurse has educated a client on isoniazid. What statement by the client indicates that teaching has been effective?
- A. I need to take extra vitamin C while on isoniazid.
- B. I should take this medicine with milk or juice.
- C. I will take this medication on an empty stomach.
- D. My contact lenses will be permanently stained.
Correct Answer: C
Rationale: The correct answer is C: "I will take this medication on an empty stomach." This indicates effective teaching because isoniazid should be taken on an empty stomach to maximize absorption. Taking it with food can reduce absorption.
A: Taking extra vitamin C is not necessary for isoniazid.
B: Taking isoniazid with milk or juice can reduce its effectiveness.
D: Contact lenses are not affected by isoniazid, so they will not be permanently stained.
Pulmonary ventilation also called
- A. inhalation
- B. exhalation
- C. Breathing
- D. all of these
Correct Answer: C
Rationale: The correct answer is C: Breathing. Pulmonary ventilation refers to the process of breathing, which involves both inhalation and exhalation. Inhalation is the act of taking in air, while exhalation is the act of expelling air. Therefore, the term "pulmonary ventilation" encompasses both inhalation and exhalation, making choice C the correct answer. Choices A and B are incorrect because they only represent one part of the breathing process. Choice D is incorrect because it suggests that all choices are correct, which is not accurate in this context.
You are up very high where barometric pressure is 447 mmHg. What is the partial pressure of oxygen in the air up there?
- A. 0.5 mmHg
- B. 40 mmHg
- C. 80 mmHg
- D. 120 mmHg
Correct Answer: C
Rationale: The correct answer is C (80 mmHg) because the partial pressure of oxygen in the air is directly proportional to the percentage of oxygen in the air. In the atmosphere, oxygen makes up approximately 21% of the air. Therefore, to calculate the partial pressure of oxygen, you would multiply the total barometric pressure by the percentage of oxygen (0.21). So, 447 mmHg x 0.21 = 94.07 mmHg. This is the partial pressure of oxygen at sea level. To find the partial pressure of oxygen at a higher altitude, you would consider the decrease in total barometric pressure. At 447 mmHg, the partial pressure of oxygen would be around 80 mmHg.
Summary:
A: Incorrect because it is too low.
B: Incorrect because it is too low.
D: Incorrect because it is too high.