A mother and two young children are found passed out in their apartment, where a space heater is on. Emergency medical technicians suspect carbon monoxide poisoning. Why is carbon monoxide dangerous?
It causes extreme depression of the respiratory rate.
It drastically decreases the pH of the blood.
It binds to the oxygen-binding site on hemoglobin, so the O2-carrying ability of the blood is reduced.
It triggers hyperventilation, causing a severe drop in PCO2 and increase in blood pH.
The Correct Answer is C
A. It causes extreme depression of the respiratory rate: CO binds hemoglobin and impairs O₂ delivery; respiratory depression is not the primary danger
B. It drastically decreases the pH of the blood: CO poisoning does not primarily cause a dramatic blood pH drop
C. It binds to the oxygen-binding site on hemoglobin, so the O₂-carrying ability of the blood is reduced: CO binds avidly to hemoglobin’s heme sites, displacing O₂ and reducing oxygen carriage and delivery
D. It triggers hyperventilation, causing a severe drop in PCO₂ and increase in blood pH: Hyperventilation is not the main mechanism of CO toxicity
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. In the mouth: little to no chemical digestion of nucleic acids occurs in the mouth.
B. In the small intestine: pancreatic nucleases (DNase, RNase) and brush-border enzymes in the small intestine chemically digest nucleic acids into nucleotides and bases.
C. In the large intestine: the large intestine is primarily for water absorption and microbial fermentation, not major nucleic acid digestion.
D. In the stomach: the stomach mainly digests proteins (pepsin) and does not significantly chemically digest nucleic acids.
Correct Answer is C
Explanation
A. Bronchomediastinal duct and subclavian duct: bronchomediastinal and subclavian are lymphatic trunks, not the two major collecting ducts.
B. Right and left thoracic ducts: there is a single thoracic duct (left-sided) and a separate right lymphatic duct; we do not have distinct “right and left thoracic ducts.”
C. Thoracic duct and right lymphatic duct: the thoracic duct drains most of the body into the left subclavian vein, and the right lymphatic duct drains the right head/neck, right upper limb, and right thorax into the right subclavian vein.
D. Lumbar duct and left lymphatic duct: “lumbar duct” is not a collecting duct term used in this context, and “left lymphatic duct” is another name sometimes used for the thoracic duct but paired with “lumbar duct” is not the standard two-collector pair.
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