Abstract: In this research, we investigate the peristaltic flow of blood through a planar channel of uniform thickness. Blood is represented by a micropolar fluid (a fluid can support coupled stresses, body couples and exhibit microrotational and microinertial effects). The problem is formulated and solved without any restrictions on the wave ratio and the Reynolds number. Perturbation method in terms of wave number ( δ) as a parameter is used to obtain analytic form for the axial velocity, the microrotation velocity and the pressure gradient to the first order. Moreover, the pressure rise and friction force have been computed numerically and the results are studied for various parameters of interest.