Which element commonly has only a proton as its nucleus?
A) helium
B) neon
C) argon
D) hydrogen
E) None of the answers is correct.
Answer: D
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During platelet plug formation, platelets release ________ and endothelial cells release ________, which lead to vasoconstriction.
A. thromboxane; endothelin B. endothelin; thromboxane C. histamine; heparin D. erythropoietin; thromboxane E. thromboxane; histamine
In the following CT of the chest, the arrow points to the:
A) arch of the azygos vein. B) arch of the aorta. C) left atrium. D) left ventricle. E) pulmonary trunk.
Blood pressure in the glomerulus is unusually high compared to other capillaries because the diameter of the ________ is greater than that of the ________.
A. afferent arteriole; efferent arteriole B. descending limb; ascending limb C. efferent arteriole; peritubular capillaries D. proximal tubule; distal tubule E. cortical radiate artery; cortical radiate vein
Which of the following group of three structures may cause apparent "constrictions" of the esophagus on an oblique chest radiograph after the patient has swallowed barium?
A) arch of the aorta, left main bronchus, diaphragm B) arch of the azygos vein, left main bronchus, diaphragm C) left brachiocephalic vein, arch of the azygos vein, diaphragm D) arch of the aorta, left main bronchus, left main pulmonary vein E) left brachiocephalic vein, arch of the aorta, left main pulmonary vein