Water movement is important in urine formation in the kidneys. Urine is formed when the blood is filtered by the kidneys into kidney tubules. Three figures are presented here that relate to how the kidney tubules respond to the administration of the hormone vasopressin. The direction that water flows in these figures is from the kidney tubules back into the blood.

Figure A. Changes in permeability of tubules in the kidney in response to the hormone vasopressin (AVP), which aids in osmoregulation.

Figure B. Density of aquaporins in kidney tubule cells before, during, and after administration of vasopressin.

Figure C. Permeability of tissues to water before, during, and after administration of vasopressin.
-How do the data in Figure A relate to the data in Figures B and C?
A) Figure B shows the method used to obtain the data in Figure A.
B) Figure C is essentially a summary of the data in Figure A.
C) Figure A is about water movement, and Figures B and C are about presence of aquaporins.
D) Figure A has data for more than 2 hours, and Figures B and C show data all collected at the same time.

Relaying a Message from a Membrane Receptor to a Molecule

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