Nokea
The partial pressure of oxygen in atmospheric air at sea level is
- A. greater than the partial pressure of oxygen in atmospheric air at the top of Mt. Everest
- B. less than the partial pressure of oxygen in atmospheric air at the top of Mt. Everest
- C. equal to the partial pressure of oxygen in atmospheric air at the top of Mt. Everest
- D. equal to the sum of partial pressures from carbon dioxide and nitrogen
Correct Answer: A
Rationale: The correct answer is A because the partial pressure of oxygen decreases with increasing altitude due to the decrease in atmospheric pressure. At sea level, the atmospheric pressure is higher, resulting in a higher partial pressure of oxygen compared to the top of Mt. Everest. Choice B is incorrect because the partial pressure of oxygen is not higher at higher altitudes. Choice C is incorrect because the partial pressure of oxygen is not equal at sea level and Mt. Everest. Choice D is incorrect because the question specifically asks about the partial pressure of oxygen only, not the sum of partial pressures from other gases.
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Before administering ephedrine, Nurse Tony assesses the patient's history. Because of ephedrine's central nervous system (CNS) effects, it is not recommended for:
- A. Patients with an acute asthma attack.
- B. Patients with narcolepsy.
- C. Patients under age
- D. Elderly patients.
Correct Answer: D
Rationale: The correct answer is D: Elderly patients. Ephedrine, a sympathomimetic amine, can exacerbate existing CNS conditions in elderly patients, leading to adverse effects like confusion, agitation, and increased risk of falls. Elderly patients are more sensitive to CNS stimulants due to age-related changes in drug metabolism and clearance, making them more susceptible to negative effects. Choices A, B, and C are incorrect because patients with acute asthma attacks may benefit from ephedrine's bronchodilator effects, patients with narcolepsy may benefit from its stimulant properties, and age alone is not a contraindication for ephedrine use.
A nurse is caring for a client who is scheduled to undergo a thoracentesis. Which intervention should the nurse complete prior to the procedure?
- A. Measure oxygen saturation before and after a 12-minute walk.
- B. Verify that the client understands all possible complications.
- C. Explain the procedure in detail to the client and the family.
- D. Validate that informed consent has been given by the client.
Correct Answer: D
Rationale: The correct answer is D: Validate that informed consent has been given by the client. This is crucial before any invasive procedure to ensure the client fully understands the risks, benefits, and alternatives. This protects the client's autonomy and promotes ethical practice.
Choice A is incorrect because measuring oxygen saturation before and after a 12-minute walk is not relevant to preparing for a thoracentesis.
Choice B is incorrect because while it is important for the client to understand possible complications, verifying this understanding is not the priority before the procedure.
Choice C is incorrect because explaining the procedure in detail to the client and family is important, but ensuring informed consent comes first to respect the client's autonomy.
Volume of air left after maximum forceful expiration in human lung is
- A. Total lung capacity
- B. Residual volume
- C. Vital capacity
- D. Tidal volume
Correct Answer: B
Rationale: The correct answer is B: Residual volume. After maximum forceful expiration, residual volume is the volume of air left in the lungs to prevent lung collapse. Total lung capacity (A) is the maximum amount of air the lungs can hold. Vital capacity (C) is the maximum amount of air that can be exhaled after a maximum inhalation. Tidal volume (D) is the volume of air moved in and out of the lungs during normal breathing, not after a forceful expiration.
In human beings the number of lobes in right and left lungs is
- A. 2 and 3
- B. 2 and 2
- C. 3 and 2
- D. 4 and 2
Correct Answer: C
Rationale: The correct answer is C: 3 and 2. The right lung has 3 lobes (upper, middle, lower), while the left lung has 2 lobes (upper and lower). This is due to the presence of the heart on the left side, occupying space that limits the left lung to 2 lobes. Option A is incorrect as the left lung has only 2 lobes. Option B is incorrect as both lungs have different numbers of lobes. Option D is incorrect as the right lung typically has 3 lobes, not 4.
Dead air is not involved in respiration because
- A. It is very low quantity
- B. It is trapped in nasal passage
- C. It contains less Oxygen
- D. It is present deep in the lungs
Correct Answer: D
Rationale: The correct answer is D because dead air is the air present in the alveoli that does not participate in gas exchange. It is located deep in the lungs, beyond the respiratory bronchioles where gas exchange occurs. Dead air does not reach the alveoli to participate in respiration. Choices A, B, and C are incorrect because the quantity of dead air or its oxygen content are not the primary reasons why it is not involved in respiration.