A 63-year-old man comes to the emergency department with back pain, weakness, and shortness of breath. On examination, he has an aneurysm of the abdominal aorta at the aortic hiatus of the diaphragm. Which of the following pairs of structures would most likely be compressed?
(A) Vagus nerve and azygos vein
(B) Esophagus and vagus nerve
(C) Azygos vein and thoracic duct
(D) Thoracic duct and vagus nerve
(E) Inferior vena cava (IVC) and phrenic nerve
Ans: (C) Azygos vein and thoracic duct
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A narrow ridge of bone is known as the ________
A) Head B) Crest C) Spine D) Condyle
Which sequence is correct for plasma proteins, from greatest to lowest concentration? (Some items may have been omitted.)
a. gamma globulins, albumins, fibrinogen b. albumins, fibrinogen, globulins c. albumins, globins, fibrinogen d. globulins, fibrinogen, albumins e. None of the above.
What is released from the structure labeled "9"?
A) sarcoplasm
B) acetylcholine
C) protein
D) calcium ions
E) acetylcholinesterase
What do semilunar valves prevent?
A) Semilunar valves prevent the flow of blood into the ventricles during atrial contraction. B) Semilunar valves prevent backflow of blood into the atria. C) Semilunar valves prevent backflow of blood into the ventricles. D) Semilunar valves prevent backflow of blood into the veins. E) Semilunar valves prevent backflow of blood into the coronary vasculature.