Countercurrent exchange is used for homeostasis both by some animals experiencing cold conditions and by kidneys in the nephron loop.

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Countercurrent exchange is a mechanism used to maintain homeostasis in both animals experiencing cold conditions and by the kidneys in the nephron loop. In animals, countercurrent exchange helps to prevent heat loss by allowing warm blood to pass by cold blood and exchange heat. In the kidneys, countercurrent exchange allows for the reabsorption of water and salts from the filtrate, which helps maintain fluid and electrolyte balance in the body.

Countercurrent Exchange Is Used for Homeostasis Both by Some Animals