How does the circulatory system work?

circulatory-systemOur blood flows in a closed circuit. It is replenished with oxygen in our lungs and is transported to our body’s organs by the heart through the arteries. These organs retain the oxygen and nutrients contained in the blood and return their waste products to it. Blood, after it releases its oxygen, is carried back to the lungs where it is replenished with oxygen.

The power behind the cardiovascular system is performed by the heart that pumps oxygenated blood through the arteries. The veins carry oxygen-free blood from our peripheral zones back to the heart.

Here we focus our attention on the veins in our lower limbs, which can be:

  • superficial veins (epifascial)
  • deep veins (subfascial, in muscular interstices)

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