User blog comment:Guts!/Anime Depiction of Luffy's Gear Second/@comment-972068-20130528014001/@comment-972068-20130529220624

Once again, there's a correlation between "fantasy" and "science" in literature. Things that happen are plausible. It's true we can't control our blood rate, but really, neither can Luffy. He pumps up his veins which causes the rate to increase, just like when we run. We get more adrenaline as we exercise, and our blood pressure increases. In a way, we're pushing our veins like Luffy does. But Luffy being made of rubber makes him more bendable. He can increase his pressure by pushing against it and make it flow around his body. That's how Gear Second works. Disregarding it just because "he's a rubber man" or "it's a manga" is just an excuse not to think.

And by the way, I gave three pieces of evidence that shows steam in more than just his arm. And you still haven't answered these questions: Why hasn't any character acknowledge this? Why did Luffy use it his entire body after he can clearly use it in one? Why did Oda put it in his entire body in Film Z?