Chakra is a Sanskrit word meaning wheel, or vortex, and it refers to each of the seven energy centers of which our consciousness, our energy system, is composed. These chakras, or energy centers, function as pumps or valves, regulating the flow of energy through our energy system. The functioning of the chakras reflects decisions we make concerning how we choose to respond to conditions in our life. We open and close these valves when we decide what to think, and what to feel, and through which perceptual filter we choose to experience the world around us. The chakras are not physical. They are aspects of consciousness in the same way that the auras are aspects of consciousness. The chakras are more dense than the auras, but not as dense as the physical body. They interact with the physical body through two major vehicles, the endocrine system and the nervous system. Each of the seven chakras is associated with one of the seven endocrine glands, and also with a group of nerves called a plexus. Thus, each chakra can be associated with particular parts of the body and particular functions within the body controlled by that plexus or that endocrine gland associated with that chakra.