get pumped

wow!  look at my arms!  they are super vascular!  molly, why do my arms get vascular from time to time?

coincidentally, i am studying the cardiovascular system right now, and i have some theories...

you get vascular because:
- your body fat is lower than 10%
- you are very hydrated
- you are using steroids
- your veins are close to the surface
- you work out regularly and you need to transport more blood to respiring cells for gas exchange, increased blood flow causes your veins and arteries to stretch
- you are too warm and your body is increasing heat loss from the surface of the skin by via vasodilation
- your body is used to caffeine which is a vasoconstrictor, but you haven't had caffeine today
- you consumed a lot of salt which causes high blood pressure and makes veins pop
- you drank alcohol which is a vasodilator
- you are using speed  ;)

if none of these are true, i have more musing to do...