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Human Physiology is the study of the functions of the human body and focus on how different systems of the human body work. The human body consists of trillions of cells which work together for the maintenance of the organism. Explanations of various systems of the human body begin at macroscopic level and proceed to a molecular level. It takes into account the workings of the human body with an effort to draw connections between the body systems and explain their interdependencies. It also explains how the body maintains balance within each system. Maintaining a constant internal environment with everything required by the cells to survive is done by various processes collectively called as homeostasis.