Base your answer to the question on the information and table below and on your knowledge of biology, A model of a cell is prepared and placed in a beaker of fluid as shown in the diagram below. The letters A, B, and represent substances in the initial experimentals
Dialysis tubing
membrane
Water
substance C
(amber color)
Water
substances A and B
(whitish color)
The table below summarizes the content and appearance of the cell model and beaker after 20 minutes.
Results After 20 Minutes
Outside of
Inside of
Cell Model Cell Model
Substances water, AC water, ABC
Color
amber
blue black
des
Identity substance and explain why it did not move out of the model cell,

The kidney filters potentially toxic substances in the blood, and thus “clears” the blood of those substances. this clearance function is dependent upon and proportional to the diffusion gradient of the substance across filtering capillaries, i.e. if the concentration of the substance is doubled, twice as much will be cleared from each ml of blood that is filtered. suppose that the body produces a constant amount of a substance x per unit of time. the kidneys eliminate substance x at a rate directly proportional to the concentration of the substance and the volume of blood cleared each minute (c): elimination = c × [x], where [x] is the steady-state concentration of substance x. imagine an individual with an initial concentration of x equal to [x]0 who develops kidney disease. her baseline clearance c0 drops to one half of the original (½c0). what is the new steady state concentration of x? (for simplicity, assume that substance x is 100% filtered by the kidney).