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Extraordinary care must be taken while studying human body for the purpose of treatment or education, etc. There are many extraordinarily yet importantly sophisticated natural systems which make up the whole human body. A few examples are the skeletal system, the muscular system, respiratory system, the reproductive system, the digestive system, the nervous system, the blood circulatory system, the urinary system, etc. The various systems consist of different organs and/or limbs which have specific functions. For example digestive system consists of hands, mouth, tongue, teeth, inner throat, stomach, small intestine, large intestine, etc. There are many parts of human body, namely: head, neck, shoulders, chest, arms, back, abdomin, buttock, legs, feet, etc. Health of every organ, limb or system is important. However, the health of some organs is vital for survival as that of heart, brain, liver, lungs, etc. Physical, psychological, mental and spiritual healths are inter-related and interdependant.