A-level Biology Notes

Roles of Veins/ Venules?

- generally, carry deoxygenated blood back to the heart

- for example, coronary veins from the heart muscles, hepatic veins from liver, renal vein from kidney

- exception 1 = pulmonary vein carries oxygenated blood back to the heart

- exception 2 = hepatic portal vein carries deoxygenated blood from digestive system to liver [for filtering]