The tube that carries urine from the bladder to outside the body, shorter in females (about 4cm) and longer in males (about 20cm) where it also carries semen.
From Greek ourethra, derived from ouron meaning 'urine,' essentially meaning 'urine passage' - another example of ancient Greek anatomical terminology being refreshingly literal.
The dramatic difference in urethral length between males and females explains why women get urinary tract infections about 30 times more often than men - bacteria have a much shorter distance to travel to reach the bladder! This 4cm versus 20cm difference is one of the most clinically significant anatomical variations between sexes.
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