Scientists have found that the quantity of aquaporin molecules inserted in the membranes of collecting duct cells changes in response to ADH levels. Draw a line graph proposing a relationship between ADH levels and its effect on the quantity of aquaporins. Additionally, explain how the relationship between ADH and aquaporins corresponds to situations of dehydration and hydration.

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1. Identify the variables for the graph: The x-axis will represent the levels of ADH (Antidiuretic Hormone), and the y-axis will represent the quantity of aquaporin molecules in the membranes of collecting duct cells.
2. Propose a relationship: As ADH levels increase, the quantity of aquaporin molecules in the collecting duct cells is likely to increase. This is because ADH plays a role in regulating water reabsorption in the kidneys by increasing the permeability of the cell membranes to water.
3. Draw the line graph: Plot the data points based on the proposed relationship and draw a line that best fits these points. The line is expected to show a positive correlation between ADH levels and the quantity of aquaporins.
4. Explain the relationship in terms of dehydration: During dehydration, the body's ADH levels increase to promote water reabsorption in the kidneys. This is achieved by inserting more aquaporin molecules into the membranes of collecting duct cells, thus increasing water permeability and reducing water loss in urine.
5. Discuss the relationship in terms of hydration: Conversely, during hydration, the body's ADH levels decrease, leading to a reduction in the number of aquaporin molecules in the collecting duct cells. This decreases water reabsorption, allowing more water to be excreted in the urine, thus maintaining fluid balance.