Its muscular wall has many folds called rugae that can contract when the bladder is emptied of urine and can expand when it is filled with urine.
膀胱壁有许
，
襞；当膀胱空虚时缩，当膀胱充盈时扩张。
Osmosis-解剖与生理
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non-abstainer, nonabstractive, nonacceptance, non-acceptance, nonaccess, non-acclimatization, nonacid, non-acid, nonacidfast, non-acidic,
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3G, 401(K), a,
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