Which of the labeled structures in the kidney represent the point where changes in the urine composition cease to occur? 
Definitions:
Marginal Cost
The additional cost incurred from producing one more unit of a product or service.
Decreasing Rate
A situation where the rate of growth or progression reduces over time.
Total Fixed Costs
The sum of all costs that do not change with the level of output, such as rent, salary, and insurance premiums.
Earrings
Jewelery pieces worn on the ear, typically fastened through a hole pierced in the earlobe or another external part of the ear.
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