Veins have valves

Veins have valves, or more precisely non return valves, preventing reverse blood flow.

Remember revision guide trying to make remembering veins have valves easier

Blood flow through vein and valves, and cross section of a vein showing the valve inside

NOTE:

Arteries don’t have valves in them (with the exception of the semilunar valves found in the pulmonary artery and the aorta).

A detailed tract diagram of blood flowing through the veins and arteries of the body

A detailed diagram of the Pulmonary and Systemic circuit including capillaries and blood flow