Answer the following question given this paragraph: 

Blood vessels are long, tube-like organs that form a complex network throughout the body. They transport blood to all the body’s cells. There are three types of blood vessels: arteries, veins, and capillaries. Transfer of substances between the blood and cells takes place across the thin walls of capillaries.


Q: Arteries and veins are two of the three types of blood vessels, what is the third?

 Choices:

- muscles

- fibroids

- neurons

- capillaries

A:
capillaries
