TEAS Respiratory System Practice Questions

5 free Respiratory System practice questions

Pick an answer and check it to see the full step-by-step explanation.

1. Question 1
   In systemic tissues, carbon dioxide enters red blood cells and is converted to bicarbonate. Which process helps maintain electrical neutrality as bicarbonate leaves the red blood cell and increases the blood’s capacity to carry CO2?

   Chloride ions move into the red blood cell (chloride shift)Potassium ions move into the red blood cell (K+ shift)Sodium ions move out of the red blood cell (Na+ shift)Calcium ions bind to hemoglobin to buffer charge

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2. Question 2
   A patient has normal hemoglobin levels but impaired oxygen unloading to tissues. Which condition would most directly cause hemoglobin to hold onto oxygen more tightly (left shift of the oxyhemoglobin dissociation curve)?

   Increased hydrogen ion concentration (acidosis)Increased carbon dioxide and decreased pH in systemic tissuesIncreased 2,3-BPG in red blood cellsDecreased temperature and decreased carbon dioxide levels

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3. Question 3
   A nurse explains that oxygen loading occurs in the lungs. Which change in the alveolar-capillary environment most directly promotes hemoglobin binding more oxygen?

   Higher partial pressure of carbon dioxide in the alveoli than in venous bloodLower blood pH in pulmonary capillaries due to lactic acid buildupHigher partial pressure of oxygen in the alveoli than in venous bloodIncreased temperature in pulmonary capillaries from active skeletal muscle

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4. Question 4
   In systemic tissues, which change most directly promotes oxygen unloading from hemoglobin to the cells?

   Increased tissue partial pressure of oxygen (PO2)Decreased tissue temperatureDecreased hydrogen ion concentration (higher pH)Increased tissue partial pressure of carbon dioxide (PCO2)

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5. Question 5
   A patient with severe anemia has a markedly reduced hemoglobin concentration but normal lung function. Which statement best describes how this affects oxygen transport in the blood?

   The oxygen content of blood decreases because less oxygen can bind to hemoglobinCarbon dioxide transport is impaired because CO2 is carried primarily bound to hemoglobinThe partial pressure of oxygen (PaO2) in arterial blood decreases because hemoglobin carries most oxygenMore oxygen is converted into bicarbonate in plasma to compensate for low hemoglobin

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