Why Do Our Veins Pop Out?

Answer

In the presence of muscle stress the vessel dilate because the demands of oxigenated blood increase and also the vessels also dilate in the presence of heat to try to decrease the temperature
Q&A Related to "Why Do Our Veins Pop Out"
They do on muscular hands, when hands have been working or have had extra pressure on them, or when the skin becomes frail/translucent usually due to old age. It has to due with how
http://wiki.answers.com/Q/Why_do_veins_pop_out_on_...
The veins in arms and legs are closer to skin surface,some people have more prominent visible
http://www.chacha.com/question/why-do-veins-pop-ou...
Not Medical Advice: Some of the causes why veins pop out are extreme temperature, age, type of work and condition of hydration.
http://www.kgbanswers.com/why-do-some-veins-pop-ou...
Veins pop out (ex: during exercise) because swelling and hardening of the muscles pushes veins up closer to the surface of the skin. This is more visible in persons with less subcutaneous
http://answers.yahoo.com/question/index?qid=201004...
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