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Science in China

  • 中国科学院
  • Non-Profit Org. (非赢利研究机构)

Scientific magazines/websites include:



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Urethra

... urethral sphincter is the skeletal muscle that allows voluntary control over urination. In the human female, the urethra is about 1-1.5 inches (25-38 mm) long and opens ...

 
 
 
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