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This study evaluates the contribution of individual organs to the Body Surface Potential Map (BSPM) generated during ventricular activation. The human torso was modeled as an inhomogeneous volume conductor using CT data, and the heart was treated as an anisotropic volume source based on Diffusion Tensor Imaging (DTI). The ventricular conduction system was also extracted from DTI scans. Excitation propagation was simulated using the Monodomain Reaction-Diffusion Equation (MD-RDE), and the resulting BSPM was computed. By selectively removing specific organs from the torso model and comparing BSPMs using correlation coefficient and relative error metrics, the study identifies the relative influence of each organ. Results confirm that the blood volume within the ventricles has the greatest impact on BSPM accuracy, with the bones, lungs, and liver having lesser but measurable effects.