Nokea
In human beings, partial pressure of carbon dioxide in the inspired and expired air is respectively
- A. 0.3 and 40 mm Hg
- B. 0.3 and 32 mm Hg
- C. 40 and 46 mm Hg
- D. 40 and 0.3 mm Hg
Correct Answer: B
Rationale: The correct answer is B (0.3 and 32 mm Hg) because in inspired air, the partial pressure of carbon dioxide is low at around 0.3 mm Hg, whereas in expired air, the partial pressure of carbon dioxide is higher at around 32 mm Hg due to gas exchange in the lungs.
Choice A (0.3 and 40 mm Hg) is incorrect because the partial pressure of carbon dioxide in inspired air is not typically as high as 40 mm Hg.
Choice C (40 and 46 mm Hg) is incorrect because the values are reversed; the partial pressure of carbon dioxide is higher in expired air compared to inspired air.
Choice D (40 and 0.3 mm Hg) is incorrect as the values are reversed, and the partial pressure of carbon dioxide in inspired air is not typically as high as 40 mm Hg.
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A client who is found unresponsive has the following arterial blood gases: pH 7.12,
PCO2 90, and HCO3 26. The nurse interprets the results as indicating which
condition?
- A. Metabolic acidosis with partial compensation
- B. Respiratory acidosis with partial compensation
- C. Metabolic acidosis without compensation
- D. Respiratory acidosis without compensation
Correct Answer: D
Rationale: The correct answer is D, respiratory acidosis without compensation. The low pH and high PCO2 levels indicate respiratory acidosis. HCO3 is within normal range, suggesting no metabolic compensation. This is not metabolic acidosis as the HCO3 level is not elevated. Not partial compensation as the HCO3 level is not compensating for the respiratory acidosis.
The concentration of nitrogen in the earth's atmosphere is approximately
- A. 78 percent.
- B. 66 percent.
- C. 50 percent
- D. 33 percent
Correct Answer: A
Rationale: The correct answer is A: 78 percent. The rationale is based on the fact that nitrogen makes up approximately 78% of the Earth's atmosphere. This is a well-known scientific fact supported by various studies and measurements. Option B, C, and D are incorrect as they do not align with the established data on the composition of the Earth's atmosphere. Nitrogen is the most abundant gas in the atmosphere, followed by oxygen, which is around 21%. Therefore, option A is the correct choice based on scientific evidence and consensus.
pharynx is a muscular tube with a length of
- A. 13cm
- B. 12cm
- C. Sinches
- D. both a and c
Correct Answer: A
Rationale: The correct answer is A: 13cm. The human pharynx is typically around 13cm in length. This length allows for the proper passage of food and liquids from the mouth to the esophagus. Choice B (12cm) is incorrect as it is slightly shorter than the average length of the pharynx. Choice C (5 inches) is also incorrect as it does not correspond to the standard unit of measurement for medical lengths. Choice D (both a and c) is incorrect as 12cm and 5 inches are not equivalent lengths for the pharynx.
Mammalian lungs have numerous alveoli for
- A. Increasing the volume of inspired air
- B. Keeping the lungs in proper shape
- C. Higher number of muscles to provide greater elasticity
- D. Increasing surface area for gaseous diffusion
Correct Answer: D
Rationale: The correct answer is D because alveoli increase the surface area for gaseous diffusion, facilitating efficient exchange of oxygen and carbon dioxide in the lungs. Alveoli are tiny air sacs where gas exchange occurs. Option A is incorrect as alveoli do not affect the volume of inspired air. Option B is incorrect as alveoli do not play a role in maintaining lung shape. Option C is incorrect as alveoli do not increase muscles in the lungs for elasticity. Therefore, the primary function of alveoli is to increase surface area for gaseous diffusion, making option D the correct choice.
A client is receiving oxygen at 4 L per nasal cannula. What comfort measure may the nurse delegate to assistive personnel (AP)?
- A. Apply water-soluble ointment to nares and lips.
- B. Periodically turn the oxygen down or off.
- C. Replaces the oxygen tubing with a different type.
- D. Turn the client every 2 hours or as needed.
Correct Answer: A
Rationale: The correct answer is A because applying water-soluble ointment to nares and lips helps prevent skin breakdown and discomfort caused by the oxygen flow. This task is within the scope of practice for assistive personnel (AP) as it does not require specialized medical knowledge or training.
Choice B is incorrect because adjusting oxygen flow should only be done by licensed healthcare providers based on the client's prescribed oxygen therapy. Choice C is incorrect as replacing oxygen tubing requires knowledge of oxygen delivery systems and potential risks associated with incorrect tubing selection. Choice D is incorrect because turning the client every 2 hours is a nursing intervention related to preventing pressure ulcers, not specifically related to oxygen therapy comfort measures.