题目内容
An experiment is conducted in which platelet function is analyzed. A substance is obtained from the dense bodies (delta granules) of normal pooled platelet from healthy blood donors. When this substance is added to platelets obtained from patients with a bleeding disorder, no platelet aggregation occurs. Adding the substance to platelets from a normal control group induces platelet aggregation. Which of the following substances is most likely to produce this effect _ _
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In an experiment, thrombus formation is studied in areas of vascular damage. After a thrombus forms in an area of vascular injury, the propagation of the thrombus to normal arteries is prevented. Researches identify a substance that diminishes thrombus propagation by binding to thrombin, converting it to a procoagulant that activates protein C. Which of the following substance is most likely to produce this effect_ _
A 44-year-old man has an acute myocardial infarction. Four days later, his ejection fraction is 25%, and cardiac output is reduced. The patient becomes increasingly dyspneic, and a chest radiograph shows bilateral pulmonary edema. These pulmonary findings are most likely caused by which of the following mechanisms _ _
Within 1 hour after a gunshot wound to the abdomen, a 19-year-old man exhibits tachycardia. His skin is cool and clammy to the touch, and blood pressure is 8030 mm Hg. Which of the following organ-specific changes is most likely to occur within 2 days after this injury _ _
A 70-year-old man who was hospitalized 3 weeks ago for a cerebral infarction is ambulating for the first time. Within minutes of returning to his hospital room, he has sudden onset of dyspnea with diaphoresis. He cannot be resuscitated. The gross appearance of the hilum of the left lung at autopsy is shown in the figure. Which of the following risk factors most likely contributed to this finding _ _
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