Nokea
The partial pressure of carbon dioxide in venous blood is approximately
- A. 40 mm Hg
- B. 45 mm Hg
- C. 50 mm Hg
- D. 70 mm Hg
Correct Answer: B
Rationale: The correct answer is B (45 mm Hg) because the partial pressure of carbon dioxide in venous blood is typically around 40-45 mm Hg. This value represents the amount of CO2 dissolved in the blood plasma. Option A (40 mm Hg) is slightly on the lower side and may not fully reflect the average value. Option C (50 mm Hg) is higher than the usual range for venous blood CO2 levels. Option D (70 mm Hg) is significantly higher than the normal range and is more characteristic of arterial blood CO2 levels. Therefore, option B is the most accurate representation of the partial pressure of CO2 in venous blood.
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Which of the following describes a correct order of structures in the respiratory passageways?
- A. pharynx, trachea, larynx, bronchi, bronchioles
- B. larynx, pharynx, trachea, bronchioles, bronchi
- C. trachea, pharynx, larynx, bronchi, bronchioles
- D. pharynx, larynx, trachea, bronchi, bronchioles
Correct Answer: D
Rationale: The correct order of structures in the respiratory passageways is D: pharynx, larynx, trachea, bronchi, bronchioles. This is the correct order because air enters the body through the pharynx, then passes through the larynx (voice box), followed by the trachea (windpipe), which branches into the bronchi, and then further divides into bronchioles. The other choices are incorrect because they do not follow the natural flow of air through the respiratory system. Choice A has the incorrect order starting with the pharynx, followed by the trachea, larynx, bronchi, and bronchioles. Choice B starts with the larynx, then pharynx, trachea, bronchioles, and bronchi, which is out of sequence. Choice C begins with the trachea, then pharynx, larynx, bronchi, and bronchioles, which is also incorrect
A nurse is caring for an older adult client who has a pulmonary infection. Which action should the nurse take first?
- A. Encourage the client to increase fluid intake.
- B. Assess the client's level of consciousness.
- C. Raise the head of the bed to at least 45 degrees.
- D. Provide the client with humidified oxygen.
Correct Answer: B
Rationale: The correct action for the nurse to take first is to assess the client's level of consciousness (Choice B) because it is essential to determine the client's current neurological status and mental acuity, which can indicate the severity of the infection and the need for immediate interventions. Assessing consciousness helps in identifying any signs of respiratory distress or potential complications. Encouraging fluid intake (Choice A) is important but not the priority when the client's respiratory status is uncertain. Raising the head of the bed (Choice C) is beneficial for improving oxygenation but should come after assessing the client's consciousness. Providing humidified oxygen (Choice D) is important for respiratory support but should be based on the assessment findings.
Fick's law of diffusion is related to
- A. Diffusion and Surface area
- B. Diffusion and membrane potential
- C. Diffusion and water content
- D. Diffusion and pore diameter
Correct Answer: A
Rationale: Fick's law of diffusion states that the rate of diffusion is directly proportional to the surface area and concentration gradient, and inversely proportional to the distance over which diffusion occurs. Therefore, Choice A - Diffusion and Surface area is correct because surface area directly affects the rate of diffusion. Choices B, C, and D are incorrect as they do not directly relate to Fick's law. B is incorrect as membrane potential is not a factor in Fick's law. C is incorrect as water content is not a key factor in the law of diffusion. D is incorrect as pore diameter is not explicitly mentioned in Fick's law.
The nurse is teaching a client with obstructive sleep apnea (OSA) about the prescribed CPAP. What information does the nurse NOT include?
- A. Insurance will cover the cost if you wear it at least 4 hours a day.
- B. Once the delivery mask is adjusted, do not loosen the straps.
- C. The CPAP provides pressure that holds your upper airways open.
- D. You need to clean the mask at least once a week to prevent infection.
Correct Answer: A
Rationale: The correct answer is A because insurance coverage for CPAP machines is generally not based on the number of hours it is worn per day but rather on medical necessity. The nurse would not include this information as it could lead to misunderstanding and incorrect assumptions. Choice B is incorrect because adjusting the mask may be necessary for comfort. Choice C is correct as CPAP does provide pressure to keep airways open. Choice D is also correct as cleaning the mask regularly is essential to prevent infections.
Which of the following is a risk factor for developing heart failure?
- A. Regular exercise
- B. Low blood cholesterol levels
- C. Smoking
- D. Adequate sleep
Correct Answer: C
Rationale: The correct answer is C: Smoking. Smoking is a risk factor for developing heart failure because it damages the blood vessels, increases blood pressure, and reduces oxygen delivery to the heart. Regular exercise (A) is actually beneficial for heart health. Low blood cholesterol levels (B) are generally considered a positive factor for heart health. Adequate sleep (D) is important for overall well-being but is not a direct risk factor for heart failure. In conclusion, smoking (C) stands out as the correct answer due to its harmful effects on the cardiovascular system.