【单选题】Leadership is hardly a new area of research, of course. For years, academics have debated whether leaders are born or made, whether a person who lacks charisma (capacity to inspire devotion and enthus...
【单选题】Which of the following statements about the harmful effects of hemoglobin bound with CO (COHb) is wrong?
A.
At levels of less than 10% of total hemoglobin, symptoms are rarely observed. At 15%, the individual experiences mild headaches.
B.
At 20% to 30%, the headache is severe and is generally accompanied by nausea, dizziness, confusion, disorientation, and some visual disturbances; these symptoms are not generally reversed if the individual is treated with oxygen.
C.
At COHb levels of 30% to 50%, the neurological symptoms become more severe, and at levels near 50%, the individual loses consciousness and can sink into coma. Respiratory failure may follow. With prolonged exposure, some damage becomes permanent.
D.
Death normally occurs when COHb levels rise above 60%.