Capillaries are the tiniest blood vessels. They are the site of gas exchange and connect veins and arteries.
Capillaries are the tiny tubes that carry blood. These tubes connect arteries and veins.
Capillaries are the tiny tubes that carry blood. These vessel connect small arteries to small veins, and are the site of gas exchange.
The tiny tubes that carry blood are the capillaries. Capillaries connect arteries and veins.
Capillaries are the tiniest of the blood vessels. They connect arteries and veins.
Capillaries are the smallest of the blood vessels, the tubes that carry blood. They connect arteries and veins.
There are millions of the tiny tubes in each of the kidney to carry blood and other nutrients both inside and outside of the kidney. The artery basically divides into many tiny blood vessels throughout the kidney.
The tubes are called capillaries.All sorts of tubes ("vessels") carry blood around the body, but the smallest are known as "capillaries", taken from Latin capillaris ("of hair", since capillaries are as thin as hairs).The smallest of blood vessels are capillaries.
Blood vessels are the tubes that carry blood. The smallest of the blood vessels are the capillaries.
The tubes that carry blood are known as the blood vessels. These include the capillaries, arteries, and veins.
The tubes that carry blood around the body are blood vessels. They comprise arteries, veins, and capillaries.
The tubes that carry blood are known as the blood vessels. They include arteries, veins, and capillaries.
The blood vessels are the tubes of various sizes that carry blood. They include arteries, capillaries, and veins.