The countercurrent mechanism in the nephron
A) creates a highly concentrated interstitial fluid so that urine can be concentrated by
the collecting ducts when they are permeable to water.
B) keeps interstitial fluid hydrated to maintain blood pressure.
C) is a method to move sodium to control its concentration.
D) keeps the volume of water lost in the urine relatively constant.
A
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The right border of the heart is supplied by the
A. right marginal artery. B. posterior interventricular artery. C. great cardiac vein. D. anterior interventricular artery. E. circumflex artery.
In the diagram, where is the I band?
a) G b) H c) I d) J e) D
Which of the following is not a mechanical barrier against microorganisms?
A) Urine B) Tears C) Diarrhea D) Saliva
What structure makes the dorsal root different from the ventral root?
A. The dorsal root has a ganglion. B. The dorsal root has a tract. C. The dorsal root has a nucleus. D. The dorsal root appears the same as the ventral root.