Tubes in the kidney. I'm not sure what they are called, though.
Blood vessels are the tubes through which blood travels. They include veins, capillaries, and arteries.
blood vessels
Blood vessels are any of the tubes through which blood flows through the body.
the three main tubes that blood can pass through in the circulatory system are the arteries, veins, and capillaries.
blood vessels
the heart pumps the blood to different part of the body
The blood travels through veins, arteries, and capalaries.
hey, this is a kewl chicky..and the answer is blood vessels.
Arteries, vessels and veins.
Blood vessels are the tubes that carry blood. The smallest of the blood vessels are the capillaries.
veins and arteries
The tubes that carry blood around the body are blood vessels. They comprise arteries, veins, and capillaries.