The Countercurrent Mechanism in the Nephron

question 32

Multiple Choice

The countercurrent mechanism in the nephron

• A)creates a highly concentrated interstitial fluid so that urine can be concentrated by the collecting ducts when they are permeable to water.
• B)is a method to move sodium to control its concentration.
• C)keeps the volume of water lost in the urine relatively constant.
• D)keeps interstitial fluid hydrated to maintain blood pressure.

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Definitions:

Comparative Advantage

Economic theory suggesting that a party should specialize in producing and trading goods that it can produce at a lower opportunity cost than others, leading to increased efficiency and profit.

Trading Partners

Countries or entities that engage in the exchange of goods and services through import and export activities.

Balance-of-Trade Surplus

A situation where the value of a country's exports exceeds the value of its imports, indicating a net positive flow of domestic currency from foreign markets.

Dollar Value of Exports

The total monetary value of all goods and services a country exports to other countries over a specific time period.