What is the urethra?

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First answer by Yulia Crowder. Last edit by Yulia Crowder.
It is a tube that connects the bladder and the body's outside. For men it serves both for the urine evacuation and the passage of sperm in its reproductive function. It measures about 8 inches (20 cm) long. It comprises 4 parts:

* Pre-prostatic urethra
* Prostatic urethra
* Membranous urethra
* Spongy urethra

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