Question

What is the role of capillaries???

Answer 1

The blood capillaries are where the important functions of the circulation take place: the exchange of material between circulation and cells. Capillaries are the smallest of the body's blood vessels. They are only one cell thick, and they are the sites of the transfer of oxygen and other nutrients from the bloodstream to other tissues in the body; they also collect carbon dioxide waste materials and fluids for return to the veins. 

Answer 2

$<i>$Here is the answer to your question

The capillary connect both arteries and veins.

Hope it helped!!