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In Humans, During sexual arousal in males, his penis will get erected with blood.

Where does this new blood coming to fill his penis which is required for erection ?

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    $\begingroup$ There are areas in our body which act as reservoir for blood , so when a body part needs excess of it can be diverted to it. ex: lungs. $\endgroup$ – JM97 Mar 7 '17 at 13:22
  • $\begingroup$ see this : biology.stackexchange.com/questions/20174/… $\endgroup$ – JM97 Mar 7 '17 at 14:21