腎元
腎元（英文：Nephron），係腎整尿（urine）嘅基本功能單位，人嘅腎大約有200萬個腎元，每一個腎元由腎小體同腎小管組成。佢嘅主要作用係做超濾作用同再吸收，調節血液入面嘅水份同溶解物質，將剩低嗰啲嘢用尿液嘅形式排出去。而且腎元重可以調節血量同埋血壓，控制電解質同代謝，調節血液嘅酸鹼值。
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