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Both red and white blood cells pass through the capillaries.
Capillaries are very thin blood vessels. Oxygen and nutrients and hormones can pass through the walls of the capillaries and reach the body's cells, while red blood cells remain in the capillaries.
So that white and red blood cells can pass through the capillaries
through arterioles
roundish
Arterioles.
As red blood cells travel through capillaries oxygen is released (disassociated) with hemoglobin. The oxygen then diffuses down it's concentration gradient into the tissues.
The blood cells must move through the capillaries in a single file line because the diameter of the capillary is only slightly larger than the diameter of the blood cells - there isn't room for two blood cells to go through side by side.
Capillaries, as they are the smallest blood vessels in the body, thus the need to "squeeze"
Capillaries
In the blood capillaries through = cells
Blood, heart, veins, arteries, capillaries, etc.oxygenred blood cells do.