blood vessels

........... These are small, thin blood vessels that connect the arteries and veins together for the exchange of gases and nutrients.

........... have very thin non elastic walls one cell thick.

.............are elastic, muscular tubes that carry blood to every part of the body.

............ : Example the Superior and Inferior Venacava which carry blood from the body back to the heart.

................. carry blood AWAY from the heart.

. Arteries: Example the .................... , the large artery leaving the heart.

Veins have .......... elastic walls than arteries as they carry blood at a lower pressure.

.......... have thick elastic walls to withstand the high blood pressure resulting from the strong pumping of the heart.

Veins carry ................, except the Pulmonary vein.

Arteries carry ..............................., except the Pulmonary artery.

There are three main types of blood vessels: .................