Natural killer cells
A. only attack bacteria.
B. are activated by IL-2 and interferon-gamma.
C. cannot interact with antibodies.
D. secrete interferon-gamma to activate helper T-cells.
E. have primary responsibility for mass-manufacturing antibodies against foreign antigens.
Answer: B
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Procedural memories
a. are associated with the temporal lobes and are closely associated limbic structures b. are associated with the cerebellum and parts of the cerebrum c. involve acquisition of motor skills gained via repetitive training d. are characterized by both a and b e. are characterized by both b and c
A 54-year-old man with a long history of alcohol abuse presents to the emergency department with rapidly increasing abdominal distention most likely resulting from an alteration in portal systemic blood flow. Which of the following characteristics is associated with the portal vein or the portal venous system?
(A) Lower blood pressure than in the IVC (B) Least risk of venous varices because of portal hypertension (C) Distention of the portal vein resulting from its numerous valves (D) Caput medusae and hemorrhoids caused by portal hypertension (E) Less blood flow than in the hepatic artery
The pattern of gray matter in the spinal cord is divided into
A) horns. B) roots of spinal nerves. C) meninges. D) funiculi.
Iron
A. prevents carbon monoxide from binding to hemoglobin. B. is a plasma coagulation factor. C. is the binding site for carbon dioxide on the hemoglobin molecule. D. is needed to produce hemoglobin. E. interferes with the normal function of hemoglobin.