Veins have valves
Veins have valves, or more precisely non return valves, preventing reverse blood flow.
NOTE:
Arteries don’t have valves in them (with the exception of the semilunar valves found in the pulmonary artery and the aorta).
![](/images/user/base/Maths/Logarithms/Reference%20Tables/reference-log-table-1.4df6ee6.jpg)
![](/images/user/base/Maths/Logarithms/Reference%20Tables/reference-log-table-2.d516bb3.jpg)
![](/images/user/base/Maths/Logarithms/Reference%20Tables/reference-anti-log-table-1.b0b0513.jpg)
![](/images/user/base/Maths/Logarithms/Reference%20Tables/reference-anti-log-table-2.f89189d.jpg)
Veins have valves, or more precisely non return valves, preventing reverse blood flow.
NOTE:
Arteries don’t have valves in them (with the exception of the semilunar valves found in the pulmonary artery and the aorta).