After reading the paragraph below, answer the questions that follow.
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.
Based on the data from these figures, what do you expect the urine of a person to be like when vasopressin is having an effect on the kidney tubules?
◦ The urine will be salty.
◦ There will be large volumes of urine.
◦ The urine will be concentrated.
◦ The urine will be dilute.
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