ATI RN
Exam Questions on Respiratory System Questions
Question 1 of 5
The most important factor in determining the percent of oxygen saturation of hemoglobin
Correct Answer: A
Rationale: The correct answer is A: The partial pressure of O2. Oxygen saturation of hemoglobin is directly related to the partial pressure of oxygen in the blood. As the partial pressure of O2 increases, more oxygen binds to hemoglobin, leading to higher oxygen saturation. Acidity (choice B) and the partial pressure of CO2 (choice C) can influence the oxygen-hemoglobin dissociation curve, but they are not the primary factors determining oxygen saturation. Choice D is incomplete and not relevant to the question.
Question 2 of 5
Which class of drugs often inhibits carbonic anhydrase and is used for certain medical conditions?
Correct Answer: C
Rationale: The correct answer is C: Carbonic anhydrase inhibitors. These drugs inhibit the enzyme carbonic anhydrase, which plays a role in various physiological processes. They are used to treat conditions such as glaucoma, epilepsy, and altitude sickness. Antibiotics (A) target bacterial infections, antihistamines (B) relieve allergy symptoms, and antidepressants (D) treat depression, making them unrelated to carbonic anhydrase inhibition.
Question 3 of 5
The patient with angina is admitted to the hospital. The patient states "I might as well have died because now I won't be able to do anything." Your best response is
Correct Answer: A
Rationale: The correct answer is A because it demonstrates active listening and empathy, allowing the patient to express their feelings. By asking for clarification, it shows interest in the patient's concerns and opens up a dialogue for further exploration. This approach can help the patient feel heard and supported, leading to better understanding and communication. Choices B, C, and D are incorrect because they do not directly address the patient's statement or feelings. B dismisses the patient's concerns, C invalidates their emotions, and D offers a general statement without acknowledging the patient's specific worries. These responses may lead to the patient feeling unheard or misunderstood, hindering effective communication and rapport building.
Question 4 of 5
Spirometry can measure all except
Correct Answer: C
Rationale: Spirometry measures lung volumes and capacities. Functional Residual Capacity (FRC) is the volume of air left in the lungs after a normal exhalation, which cannot be directly measured by spirometry. Therefore, C is correct. IC (Inspiratory Capacity) is the maximum volume of air that can be inhaled after a normal exhalation, ERV (Expiratory Reserve Volume) is the additional volume of air that can be exhaled after a normal exhalation, and Vital Capacity is the total volume of air that can be exhaled after a maximum inhalation, all of which can be measured using spirometry.
Question 5 of 5
Alveolar ventilation in a male with a respiratory rate of 10/min and tidal volume of 600 ml is
Correct Answer: D
Rationale: The correct answer is D: 4500ml. Alveolar ventilation is calculated by multiplying tidal volume by respiratory rate. In this case, 600ml (tidal volume) x 10/min (respiratory rate) = 6000ml/min. However, we need to consider dead space ventilation, which is about 150ml. Therefore, the final alveolar ventilation is 6000ml/min - 150ml = 5850ml/min. Since the question asks for alveolar ventilation per minute, the correct answer is the closest option, which is D: 4500ml. Choices A, B, and C are incorrect because they do not accurately reflect the calculation of alveolar ventilation based on the provided respiratory rate, tidal volume, and dead space ventilation.