Nokea
The concentration of carbon dioxide in the earth's atmosphere is
- A. 0.004 percent.
- B. 0.04 percent.
- C. 0.4 percent
- D. 4.0 percent.
Correct Answer: B
Rationale: The correct answer is B (0.04 percent) because the concentration of carbon dioxide in the Earth's atmosphere is around 400 parts per million (ppm), which is equivalent to 0.04 percent. This concentration is widely accepted by scientific research and measurements. Choice A (0.004 percent) is too low and doesn't accurately reflect the actual concentration. Choice C (0.4 percent) and choice D (4.0 percent) are both too high, which are significantly above the current levels of carbon dioxide in the atmosphere. Therefore, B is the correct choice as it aligns with the established scientific data on carbon dioxide concentration in the atmosphere.
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Carbon dioxide and water combine to form
- A. hydrochloric acid
- B. oxygen
- C. carbonic acid
- D. carbaminohemoglobin
Correct Answer: C
Rationale: The correct answer is C: carbonic acid. When carbon dioxide and water combine, they form carbonic acid through a chemical reaction known as hydration. This process is essential for the transportation of carbon dioxide in the blood and plays a crucial role in maintaining the body's pH balance. Hydrochloric acid (A) is formed by the reaction of hydrogen chloride gas with water. Oxygen (B) is not a product of the reaction between carbon dioxide and water. Carbaminohemoglobin (D) is a compound formed by the binding of carbon dioxide to hemoglobin in red blood cells, not a direct product of the reaction between carbon dioxide and water.
What does a nurse assess postoperatively in a client with a nasal fracture?
- A. Allergic reaction
- B. Airway obstruction
- C. Extreme sense of smell
- D. Stridor
Correct Answer: B
Rationale: The correct answer is B. Airway obstruction is a critical concern after a nasal fracture due to potential swelling or displacement of bone fragments. A (allergic reaction) is unrelated. C (extreme sense of smell) is not a concern postoperatively. D (stridor) indicates severe airway compromise but is less common in nasal fractures.
An increase in the level of carbon dioxide in the blood will result in a(n):
- A. decrease in the rate of breathing.
- B. increase of the respiratory rate.
- C. decrease of pulmonary ventilation.
- D. decrease of the alveolar ventilation rate.
Correct Answer: B
Rationale: The correct answer is B: an increase of the respiratory rate. When carbon dioxide levels rise in the blood, it triggers the body to increase the rate of breathing to eliminate excess carbon dioxide through exhalation. This is known as the respiratory drive, controlled by the respiratory centers in the brainstem. Increasing the respiratory rate helps to restore the balance of gases in the blood.
Incorrect Choices:
A: Decrease in the rate of breathing - This is incorrect because high levels of carbon dioxide would stimulate an increase in breathing rate, not a decrease.
C: Decrease of pulmonary ventilation - This is incorrect as an increase in carbon dioxide would typically lead to an increase, not a decrease, in pulmonary ventilation.
D: Decrease of the alveolar ventilation rate - This is incorrect because an increase in carbon dioxide would prompt an increase in alveolar ventilation to remove excess carbon dioxide from the blood.
A nurse is teaching a client about possible complications and hazards of home oxygen therapy. About which complications doesn't the nurse plan to teach the client?
- A. Absorptive atelectasis
- B. Combustion
- C. Dried mucous membranes
- D. Alveolar recruitment
Correct Answer: D
Rationale: The correct answer is D - Alveolar recruitment. This is because alveolar recruitment is actually a benefit of home oxygen therapy, not a complication. It helps improve oxygenation by opening up collapsed alveoli.
A - Absorptive atelectasis is a potential complication where nitrogen is absorbed from the alveoli leading to collapse. B - Combustion is a hazard due to oxygen's flammability. C - Dried mucous membranes is a common complication of oxygen therapy due to the drying effect of oxygen.
What keeps alveoli from collapsing?
- A. Carina
- B. Surfactant
- C. Empyema
- D. Thoracic cage
Correct Answer: B
Rationale: Surfactant is a substance that prevents the collapse of alveoli by reducing surface tension, allowing them to remain open and functional during the breathing process.