Heart, blood, arteries, veins The human body is a complex machine. Nearly 70% of it is made up of water, and every part of our body performs a different function. A vital component within the circulatory system is the cardiovascular …
Veins: What are they? Veins are one of the major carriers of blood in your body. They circulate blood from your heart and back to it again. Veins also help to regulate blood pressure, keep you cool, and maintain the …