Which thin-walled blood vessels lack muscular walls?
Veins
Arterioles
Capillaries
Arteries
Which blood vessel does not carry oxygen rich blood?
Pulmonary vein
Pulmonary artery
Capillaries
Arteriole
How do arteries differ in structure from capillaries and veins?
Arteries have more elastin in tissue than veins and capillaries.
Arteries appear flatter in a cross section than veins and capillaries.
Arteries have valves which are absent in veins and capillaries.
Arteries have walls that are thinner than veins and capillaries.