Encyclopedia > 40th century BC

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40th century BC

(40th century BC - 39th century BC - other centuries)

(5th millennium BC - 4th millennium BC - 3rd millennium BC)


Events:

Significant persons:

Inventions, Discoveries, Introductions:



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Urethra

... external 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 ...

 
 
 
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