  The blood vascular system consists of blood vessels such as arteries,
arterioles, capillaries and veins that convey blood throughout the body. The
pressure difference which exists between the ends of the vessels provides the
living force required to the flow of blood. In this study, we have used a model
that is appropriate for use with blood flow simulation applications. We study
the effect of decomposition of plaques and or tumour cells on the velocity
profile, pressure of the incompressible, Newtonian fluid. We consider two
different cases; vessels with bifurcation and without bifurcations and we
display all the results through using Commercial software COMSOL Multiphysics
5.2.
