Before revision: However, this is difficult because the smallest capillaries are 2 μm across (2.0 x 10-6m ); blood cells are about 7μm but they are easily pliable and can squeeze through the capillaries.
After revision: However, this is difficult because the smallest capillaries are 2 μm across (2.0 x 10−6m ); blood cells are about 7μm but they are easily pliable and can squeeze through the capillaries.