 The study examined how changes in hematocrit affect the flow of blood through small vessels. The researchers used a computer model to simulate the movement of red blood cells and plasma in two dimensions. They found that as hematocrit increases, the red blood cells become less deformed, resulting in slower flow and greater resistance to blood flow. This finding corresponds to previous experimental data. This article was authored by Kenichi Tsuboda, Shigeyawada, and Takami Yamaguchi.