A nurse caring for a client removes the client's oxygen as prescribed. The client is now breathing what percentage of oxygen in the room air?
- A. 14%
- B. 21%
- C. 28%
- D. 31%
Correct Answer: B
Rationale: The correct answer is B (21%). Room air contains approximately 21% oxygen. By removing the supplemental oxygen, the client is now breathing the oxygen content present in the surrounding air. Choices A, C, and D are incorrect as they do not reflect the standard oxygen concentration in room air. Oxygen concentration in room air is typically around 21%, making choice B the most accurate option.
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Tuberculosis in man is caused by
- A. A type of bacteria
- B. A virus
- C. A protozon
- D. Malnutrition
Correct Answer: A
Rationale: The correct answer is A: A type of bacteria. Tuberculosis is caused by Mycobacterium tuberculosis, a type of bacteria. This bacterium infects the lungs and can spread to other parts of the body. The other choices (B: A virus, C: A protozoan, D: Malnutrition) are incorrect because tuberculosis is specifically caused by a bacterial infection, not a virus, protozoan, or malnutrition. Bacteria can be identified through specific staining techniques and culture methods, distinguishing them from viruses and protozoa. Malnutrition is a risk factor for developing tuberculosis but is not the direct cause of the disease.
Which of the following processes does atmospheric pressure play a role in?
- A. pulmonary ventilation
- B. production of pulmonary surfactant
- C. resistance
- D. surface tension
Correct Answer: A
Rationale: The correct answer is A: pulmonary ventilation. Atmospheric pressure plays a crucial role in pulmonary ventilation by creating a pressure gradient that allows air to flow into and out of the lungs during inhalation and exhalation. When the atmospheric pressure is higher than the pressure inside the lungs, air moves in (inhalation); when the pressure inside the lungs is higher, air moves out (exhalation).
Summary of why the other choices are incorrect:
B: Production of pulmonary surfactant is not directly influenced by atmospheric pressure. Pulmonary surfactant reduces surface tension in the alveoli to prevent collapse.
C: Resistance in the respiratory system is mainly influenced by airway diameter and elasticity of the lungs, not atmospheric pressure.
D: Surface tension in the alveoli is affected by pulmonary surfactant, not atmospheric pressure.
The organ of the respiratory system that closes when food is being swallowed is the:
- A. nose
- B. pharynx
- C. larynx
- D. trachea
Correct Answer: C
Rationale: The correct answer is C: larynx. The larynx houses the vocal cords and serves as a passageway for air between the pharynx and trachea. During swallowing, the larynx closes to prevent food and liquids from entering the airway, directing them towards the esophagus instead. The nose (A) is not directly involved in swallowing. The pharynx (B) is a shared pathway for both air and food, but it does not actively close during swallowing. The trachea (D) is responsible for transporting air to and from the lungs and does not play a role in swallowing.
Which statement is false?
- A. Dorsal respiratory group in upper pons is responsible for inspiration
- B. Apneustic centre can inhibit the inspiratory centre
- C. Pneumotaxic centre is responsible for prolonged inspiratory gasp interrupted by transient expiratory efforts
- D. None of the above
Correct Answer: D
Rationale: The correct answer is D, None of the above, is false.
A: Dorsal respiratory group in the upper pons is indeed responsible for inspiration.
B: The apneustic centre can inhibit the inspiratory centre, so this statement is true.
C: The pneumotaxic centre is responsible for regulating the duration and depth of each breath, not for a prolonged inspiratory gasp interrupted by expiratory efforts.
Therefore, choice D is false as all the other statements are accurate.
The patient with sleep apnea is fitted with a continuous positive airway pressure (CPAP) mask and asks the nurse how this device will help. How should the nurse respond?
- A. The device delivers constant positive pressure to keep your airway open.
- B. The device will require you to be intubated to open your airway.
- C. The device delivers oxygen only when you are apneic.
- D. The device delivers negative pressure to stimulate your respirations.
Correct Answer: A
Rationale: The correct answer is A because a CPAP mask delivers a constant positive pressure to keep the airway open during sleep, preventing airway collapse and interruptions in breathing. This helps improve oxygenation and reduce the frequency of apnea episodes. Choice B is incorrect as intubation is not required with CPAP. Choice C is incorrect as CPAP does not deliver oxygen, it only provides pressurized air. Choice D is incorrect as CPAP delivers positive pressure, not negative pressure, to support breathing.