The word “chakra” comes from the Sanskrit language, and it refers to the energy centers in the body which are rooted in the nerves. Each chakra is shaped like a wheel or flower. Also, each chakra represents a body part. When one analyzes a specific body part, the progression of the soul can be seen. Example: Vishuddha, the throat chakra, governs the thyroid gland which is responsible for growth. On a spiritual level, it is responsible for the communication of thoughts which results in freedom.
View http://en.wikipedia.org/wiki/Chakra for an extensive report.