Man penis is made up of 3 chambers  - 2  large ones on thetop, which is yourerectile  tissue(Corpora Cavernosa),
and 1 smaller chamber on the bottomfrom which your urinate and ejaculate(Corpus Spongisum). 

The corporacavernosa are the two bodies of erectile tissueon each side of the penis.  

When you are sexual aroused your brain releases a hormone causing blood to enter the penis and fill your erectile tissue (Corpora Cavernosa). Corpora The cells inthe Corpora Cavernosa arefilled with blooduntil an erection is achieved.     


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