[quote]analog_kid wrote:
Ok, I’ll add to the fire. How come at random times of the day I am more vascular than others? And while I am doing any movment with a lot of arm involvment it looks like I have garden hoses under my skin but 90% of the time when I’m not lifting I can’t even see them?[/quote]
This was answered already. The only reason you have veins is because those extremeties need blood. If they need MORE blood (as in, when you are lifting or if they get bigger through training) more veins will be produced or there will be an increase in the size of the ones available.
Daily fluctations in body water and activity can have much to do with visability. Your body is never static (that means it is never in a non-changing state). It is always tearing down (catabolism) and building up (anabolism). It will do this until you die. That means you don’t even have the exact same body right now that you had when you woke up this morning (some cells died, some were sloughed off, some were added). That is about as simple as I can put it.