If not, then you will see them now. The human body has about 60 000 miles of blood vessels. The blood vessels are arteries, veins and capillaries.
Three things to note:
1. arteries carry the blood from the heart to the body (they are hidden deeper inside the body)
2. capillaries connect the arteries with the veins
3. veins bring blood back from the body to the heart (they can even be seen at surface skin)
Of course, blood circulation is way more complex, but you get the idea. Here you can see more about how the heart works and how the blood flows though you: