How many electrons are shared by the oxygen atoms in an oxygen molecule?
A) one electron
B) eight electrons
C) 1 pair of electrons
D) 2 pairs of electrons
E) 3 pairs of electrons
Answer: D
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The extracellular fluid compartment includes the interstitial fluid and blood plasma
Indicate whether the statement is true or false.
The sacrotuberous ligament:
A) passes through the greater sciatic notch. B) attaches to the ala of the sacrum. C) resists posterosuperior rotation of the sacrum (inferior aspect moving posteriorly and superiorly). D) passes through the obturator foramen. E) prevents posterior dislocation of the femoral head.
Cytotoxic T cells
A. attach to the surface of cells, causing them to lyse. B. cause precipitation of antigens. C. have IgG antibodies on their cell membranes. D. are destroyed after contact killing. E. produce antibodies for general circulation.
The osmotic gradient in the medullary region of the kidneys is established and maintained by which of the following?
A) Na+/K+/Cl- cotransporters in the ascending limb of the loop of Henle B) Na+/K+/Cl- cotransporters in the descending limb of the loop of Henle C) efflux of Na+ from the descending limb of the loop of Henle D) efflux of water from the ascending limb of the loop of Henle E) efflux of water from the descending limb of the loop of Henle