How does blood viscosity relate to concentration of a liquid?

Blood and liquids are often compared. Blood has more viscosity than water. Viscosity is very important for liquids as it gives the liquids te possibility to flow through the vessels.

Explanation:

That is why blood's viscosity has to be around 4,5 as it is making the blood flow easily and provides good circulation. Water doesn't have this hight viscosity. It is around 1. As the viscosity of blood is higher the circulation is worse.