Nokea
Partial pressure of O2 in the inspired air is 156 mm Hg and that of CO2 is
- A. 0.3 mm Hg
- B. 0.5 mm Hg
- C. 140 mm Hg
- D. 46 mmHg
Correct Answer: A
Rationale: Step-by-step rationale:
1. Inspired air has O2 partial pressure of 156 mm Hg.
2. In alveoli, O2 is exchanged with CO2.
3. CO2 partial pressure in alveoli is lower than in inspired air.
4. Therefore, CO2 partial pressure in inspired air must be much lower.
5. Choice A (0.3 mm Hg) is the only option significantly lower than O2 pressure, making it the correct answer.
Summary:
- Choice A is correct as it reflects the lower CO2 partial pressure compared to O2.
- Choices B, C, and D are incorrect as they do not show a significant difference in partial pressure compared to O2.
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A client who has chronic heart failure is admitted to the emergency department with severe dyspnea and a dry hacking cough. Which action should the nurse take first?
- A. Auscultate the abdomen
- B. Check the capillary refill
- C. Auscultate the breath sounds
- D. Ask about the patient's allergies
Correct Answer: C
Rationale: The correct action for the nurse to take first is to auscultate the breath sounds (Choice C) because the client is presenting with severe dyspnea and a dry hacking cough, which are indicative of respiratory distress in a patient with chronic heart failure. Auscultating the breath sounds will help the nurse assess the presence of crackles, wheezing, or decreased air entry, providing crucial information about the client's respiratory status and guiding immediate interventions. Checking the capillary refill (Choice B) is important but not the priority in this situation. Auscultating the abdomen (Choice A) is not relevant to the presenting symptoms. Asking about the patient's allergies (Choice D) is important but can be addressed after addressing the immediate respiratory distress.
The cartilage which are triangular pieces of hyaline cartilage and influence the position and tension of vocal cords?
- A. thyroid cartilage
- B. paired arytenoid
- C. paired comiculate
- D. cricoid cartilage
Correct Answer: B
Rationale: The correct answer is B: paired arytenoid cartilage. These cartilages are triangular and play a crucial role in adjusting the tension and position of the vocal cords, thus affecting voice pitch and quality. The thyroid cartilage (A) is a large shield-shaped cartilage, the corniculate cartilage (C) is small and horn-shaped, and the cricoid cartilage (D) is a ring-shaped cartilage. These cartilages do not directly influence the vocal cords' tension and position.
The greatest quantity of air that can be expired after a maximum inspiratory effort is its
- A. Residual volume
- B. Tidal volume
- C. Vital capacity
- D. Lung volume
Correct Answer: C
Rationale: The correct answer is C: Vital capacity. Vital capacity is the maximum amount of air a person can expel from the lungs after a maximum inhalation. It is the sum of tidal volume, inspiratory reserve volume, and expiratory reserve volume. Residual volume (A) is the air left in the lungs after maximum exhalation. Tidal volume (B) is the amount of air inhaled and exhaled during normal breathing. Lung volume (D) is a general term and not a specific measure of air quantity. Thus, vital capacity is the best choice as it accounts for the maximum air that can be expired after a deep inhalation.
A nurse assesses clients on the medical-surgical unit. Which client is at greatest risk for development of obstructive sleep apnea?
- A. A 26-year-old woman who is 8 months pregnant.
- B. A 42-year-old man with gastroesophageal reflux disease.
- C. A 55-year-old woman who is 50 lb (23 kg) overweight.
- D. A 73-year-old man with type 2 diabetes mellitus.
Correct Answer: C
Rationale: The correct answer is C, a 55-year-old woman who is 50 lb overweight. Obesity is a major risk factor for obstructive sleep apnea (OSA) due to excess fat in the neck area that can obstruct the airway during sleep. This increases the likelihood of experiencing breathing pauses. Pregnancy (choice A) may cause temporary OSA due to hormonal changes, but it's not the greatest risk factor among the options provided. Gastroesophageal reflux disease (choice B) and type 2 diabetes mellitus (choice D) are associated with sleep disturbances, but they are not as directly linked to OSA as obesity.
Of the four parts of respiration the part when oxygen and carbon dioxide are exchanged in the capillaries lining the alveoli in the lungs is:
- A. pulmonary ventilation
- B. external respiration
- C. transport of respiratory gases
- D. internal respiration
Correct Answer: B
Rationale: The correct answer is B: external respiration. This is the part of respiration where oxygen and carbon dioxide are exchanged in the capillaries lining the alveoli in the lungs. During external respiration, oxygen from the alveoli diffuses into the bloodstream while carbon dioxide from the bloodstream diffuses into the alveoli to be exhaled.
A: Pulmonary ventilation refers to the process of breathing, specifically the movement of air in and out of the lungs. This does not involve the actual exchange of gases in the alveoli.
C: Transport of respiratory gases involves the movement of oxygen and carbon dioxide through the bloodstream to and from the tissues. This is not specifically related to the exchange of gases in the alveoli.
D: Internal respiration refers to the exchange of gases between the bloodstream and the tissues at the cellular level. This does not specifically occur in the alveoli of the lungs.