Veins of the upper arm include all of the following veins except the
A) basilic vein.
B) cephalic vein.
C) brachial vein.
D) axillary vein.
E) median cubital vein.
Answer: E
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Most of the calcium that triggers contraction of cardiac muscle comes
A. into the cell through leakage channels in the sarcolemma. B. into the cell through voltage-gated channels in the sarcolemma. C. from the sarcoplasmic reticulum of the cell. D. from the Golgi apparatus of the cell.
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
Define permeability
What will be an ideal response?
Starting from the collecting duct, indicate the order in which urea molecules move to maintain the medullary concentration gradient. (1) ascending limb
(2) distal convoluted tubule (3) interstitial fluid (4) collecting duct (5) descending limb A. 2, 5, 1, 4, 3 B. 1, 3, 5, 2, 4 C. 3, 5, 1, 2, 4 D. 4, 2, 1, 3, 5 E. 4, 3, 5, 1, 2