Nokea
At a PO2 of 70 mm Hg and normal temperature and pH, hemoglobin is ________ percent saturated with oxygen.
- A. 10
- B. 25
- C. 50
- D. more than 90
Correct Answer: D
Rationale: The correct answer is D (more than 90). At a PO2 of 70 mm Hg, hemoglobin is more than 90% saturated with oxygen due to the high oxygen affinity of hemoglobin at this partial pressure. Hemoglobin exhibits near-maximal saturation at this level, promoting efficient oxygen binding and transport. Choices A, B, and C are incorrect as they do not accurately reflect the high oxygen saturation levels associated with a PO2 of 70 mm Hg.
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The nurse recognizes that additional teaching is needed when the patient with asthma says
- A. a. I should exercise every day if my symptoms are controlled.
- B. b. I may use over-the-counter bronchodilator drugs occasionally if I develop chest tightness.
- C. c. I should inform my spouse about my medications and how to get help if I have a severe asthma attack.
- D. A diary to record my medication use, symptoms, peak expiratory flow rates, and activity levels will help in adjusting my therapy.
Correct Answer: D
Rationale: Additional teaching is needed when the patient mentions using over-the-counter bronchodilator drugs occasionally. This is not recommended as it can mask underlying issues and delay proper treatment.
The abnormal assessment findings of dullness and hyperresonance are found with which assessment technique?
- A. Inspection
- B. Palpation
- C. Percussion
- D. Auscultation
Correct Answer: C
Rationale: The correct answer is C because dullness and hyperresonance are abnormal assessment findings that are identified through percussion techniques.
Respiratory mechanism is controlled by
- A. Central nervous system
- B. Sympathetic nervous system
- C. Parasympathetic nervous system
- D. Autonomic nervous system
Correct Answer: A
Rationale: The correct answer is A: Central nervous system. The respiratory mechanism is controlled by the brainstem, specifically the medulla oblongata and pons. These areas of the central nervous system regulate breathing by monitoring levels of carbon dioxide and oxygen in the blood. The medulla sets the basic rhythm of breathing, while the pons helps fine-tune the breathing rate. Choices B, C, and D are incorrect because while the sympathetic and parasympathetic nervous systems are involved in regulating various bodily functions, they do not directly control the respiratory mechanism. The autonomic nervous system, which includes both the sympathetic and parasympathetic divisions, plays a role in involuntary functions like heart rate and digestion, but it is not the primary controller of breathing.
Which of the following are structural features of the trachea?
- A. C-shaped cartilage
- B. smooth muscle fibers
- C. cilia
- D. all of the above
Correct Answer: D
Rationale: The correct answer is D because all the choices are structural features of the trachea. A is correct as the trachea has C-shaped cartilage rings for structural support. B is correct as the trachea contains smooth muscle fibers that help regulate airflow. C is correct as the trachea is lined with cilia that help sweep mucus and foreign particles out of the respiratory tract. Therefore, all of the above choices are structural features of the trachea, making D the correct answer.
A client with suspected tuberculosis will most likely relate which clinical manifestations?
- A. Fatigue, weight loss, low grade fevers, night sweats.
- B. Dyspnea, chest pain, cough.
- C. Rapid shallow breathing, prolonged labored expiration, stridor.
- D. Dyspnea, hypoxemia, decreased pulmonary compliance.
Correct Answer: A
Rationale: The correct answer is A. A client with suspected tuberculosis is likely to experience fatigue, weight loss, low-grade fevers, and night sweats due to the chronic infection affecting the body. Fatigue and weight loss are common symptoms of active tuberculosis due to the systemic impact of the infection. Low-grade fevers and night sweats are characteristic of tuberculosis due to the body's immune response. These symptoms are key indicators of tuberculosis infection.
Choices B, C, and D are incorrect because they describe symptoms that are not typically associated with tuberculosis. Dyspnea, chest pain, and cough (Choice B) are more commonly seen in respiratory conditions such as pneumonia or bronchitis. Rapid shallow breathing, prolonged labored expiration, and stridor (Choice C) are indicative of airway obstruction rather than tuberculosis. Dyspnea, hypoxemia, and decreased pulmonary compliance (Choice D) are more characteristic of conditions such as chronic obstructive pulmonary disease (COPD) rather than tuberculosis.