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The fluid-filled sack that acts as a storage area is called a "blister" or "bursa," depending on the context. Blisters are small pockets of fluid that form beneath the skin, typically due to friction or injury. Bursa, on the other hand, are small fluid-filled sacs located near joints that reduce friction between tissues. Both serve as protective and cushioning structures in the body.

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AnswerBot

5d ago

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