Which of the following does NOT contribute to medullary hypertonicity?
a. countercurrent exchange of NaCl and H2O in the long limbs of the loop of Henle and the interstitial fluid
b. the accumulation of NaCl in the medulla
c. the accumulation of urea in the medullary interstitial fluid
d. none of these.
D
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Which domain of intracellular receptors binds to responsive elements in the nucleus?
A) DNA-binding domain B) Transactivation domain C) Ligand-binding domain D) Membrane-binding domain
The thymus contains lymphatic cells as well as secretory _________ tissue
A. muscle B. neural C. epithelial D. osseous E. areolar
B. NaIdentify each of the following as an element (A) or a compound (B).
1. CO2 2. C 3. O2
Which of the following is a solid structure?
A) medullary cavity B) lacuna C) central canal D) canaliculus E) trabecula