Whole blood is roughly three to four times more viscous than water. Plasma alone is only a little thicker than water. The red cells are what turn the mixture syrupy.
Thickness matters for the pump. A higher share of cells makes blood harder to push, which is one reason flow and pressure change when that share rises or falls.
It still looks like a simple red liquid. Compared with the water it is mostly made from, it is a heavier freight to move.
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