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51) Which of the following is a disadvantage of pulse oximetry? A) Tissue hypoxia may be present even with a normal SaO2 reading. B) Pulse oximetry cannot differentiate between hemoglobin bound to oxygen and hemoglobin bound to carbon monoxide. C) Pulse oximetry gives no information about the amount of carbon dioxide in the blood. D) All of the above are disadvantages. 52) The movement of oxygen from the alveoli to the blood in the pulmonary capillaries depends on: A) Facilitated transport by way of the hemoglobin molecule B) Active transport of oxygen from an area of lower concentration to an area of higher concentration C) Diffusion of oxygen from an area of higher concentration to an area of lower concentration D) Osmosis of the H2O molecule across the respiratory membrane, where oxygen dissociates from hydrogen 53) A portable suction device should generate a flow rate of ________ liters per minute when the tube is open. A) 20 B) 30 C) 40 D) 50 54) As the thoracic cavity begins to expand, the intrathoracic pressure: A) Does not change B) Is greater than atmospheric pressure C) Is the same as atmospheric pressure D) Is less than atmospheric pressure 55) When a bag-valve ventilation device is used with supplemental oxygen, it delivers an oxygen concentration of ________ percent. A) 40 B) 90 C) 60 D) 21 56) In which of the following patients would the use of a Combitube dual lumen airway be used with caution? A) A 28-year-old male who is in cardiac arrest after his kayak capsized, trapping him under water for several minutes B) A 40-year-old female who has taken an overdose of tricyclic antidepressants and is unresponsive to all stimuli C) A 59-year-old male with a history of chronic alcoholism who was found in cardiac arrest at a homeless shelter D) A 16-year-old female who is unresponsive following a motor vehicle collision in which she was ejected, sustaining traumatic brain injury 57) When a portion of the lung is unavailable for gas exchange, yet pulmonary circulation continues in that area of the lung, a condition known as ________ results. A) Pulsus paradoxus B) Ventilation-perfusion mismatch C) Atelectasis D) Eupnea 58) Physiologically, the term respiration refers to the: A) Exchange of gases at the alveolar-capillary interface B) Mechanical process that moves air into and out of the lungs C) Exchange of all gases, nutrients, and wastes at the cellular level D) Exchange of gases at the cellular level 59) Without adequate airway maintenance and ventilation, the patient can succumb to brain injury or death in how many minutes? A) 4 B) 10 C) 6 D) 12 60) The bifurcation of the trachea is called the: A) Glottic opening B) Hilum C) Cricoid cartilage D) Carina

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