User blog comment:Guts!/Anime Depiction of Luffy's Gear Second/@comment-972068-20130528014001/@comment-5640399-20130529215255

You said it yourself, nada, he's a rubber man, it's is actually plausible for blood to be flowing at different rates within his body. Expanding the blood vessels leading in and out of the arm to allow them to hold more blood and having the heart force the blood into the arm would cause the pressure to make the blood flow faster in the arm. Once outside the arm, the expanded blood vessels remove the pressure and the blood moves at it's normal pace. Provided blood flows into the arm at an equal rate to that with which it leaves the arm it the speed doesn't matter. Also, science can't do any of the shit in One Piece so using it should be done sparingly, you can't use it as proof. Normal people can't control the rate of blood flow in different parts of their body, that doesn't mean Luffy can't, his makeup is more flexible than ours. Chapter 641, the sixth page, Luffy appears to use G2 in his right arm alone and when he uses Red Hawk there again is no evidence of steam rising from anywhere other than his arm. I don't know how he does it, but it seems arbitrary to keep arguing this, Luffy appears to be able to use G2 in a single limb, even in the panels following the one SHL posted their is no steam coming from anywhere other than his arm and you've not really produced any evidence to the contrary.