Elaborate this paragraph?

The importance of HRM has increased these days as the organization's objectives can only be achieved with the co-operation of the people working in the organization. Human Resource Management is the heart and essence of being a HR manager, the nearest analogy to the human body. HRM is not the brain, the controller, nor only just a limb, a member, nor yet the bloodstream - the energizing force. It is the nervous system - the line channel, inherent in the whole body and intimately connected with every movement.