Veins can be round also. However arteries have a higher pressure than veins. One reason that a tech uses a band around the arm to take blood from a vein is to make it more prominent or "round".
Capillaries. They are the microscopic tubes that connect the veins and the arteries.
CAPILLARIES
Capillaries
capillaries
capillaries
Capillaries
capillaries
Capillaries are the microscopic blood vessels that connect small arteries to small veins. Blood exchange takes place in capillaries.
they are called capillaries
they are called capillaries
The three types of blood vessels in the body are veins, arteries, and capillaries. Arteries carry blood away from the heart. Veins carry blood to the heart. Capillaries are microscopic vessels that are found in the lungs and muscles.
the three blood vessels are the Veins capillaries Arteries the arteries.