Chakras are energy wheels or points in the body which govern our energy system and more.

Thank you, Wikipedia.

7 - Sahasrara, the Sanskrit name for the Crown Chakra, which means 1000 petalled lotus, is generally considered to be the chakra of pure consciousness, within which there is neither object nor subject. When the female kundalini Shakti energy rises to this point, it unites with the male Shiva energy, and a state of liberating samadhi is attained. Symbolized by a lotus with one thousand multi-coloured petals, it is located either at the crown of the head, or above the crown of the head. Sahasrara is represented by the colour white and it involves such issues as inner wisdom and the death of the body.

Its role may be envisioned somewhat similarly to that of the pituitary gland, which secretes hormones to communicate to the rest of the endocrine system and also connects to the central nervous system via the hypothalamus.

Sahasrara's inner aspect deals with the release of karma, physical action with meditation, mental action with universal consciousness and unity, and emotional action with "beingness".

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6 - Ajna, the Sanskrit name for the sixth or Third Eye Chakra, is linked to the pineal gland. The pineal gland is a light sensitive gland that produces the hormone melatonin which regulates sleep and waking up. Ajna's key issues involve balancing the higher & lower selves and trusting inner guidance.The color is clear or white.

Ajna's inner aspect relates to the access of intuition. Mentally, Ajna deals with visual consciousness. Emotionally, Ajna deals with clarity on an intuitive level.

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5 - Vishuddha, the Sanskrit name for the Throat Chakra,  may be understood as relating to communication and growth through expression. The color is blue. This chakra is paralleled to the thyroid, a gland that is also in the throat and which produces thyroid hormone, responsible for growth and maturation.

Physically, Vishuddha governs communication, emotionally it governs independence, mentally it governs fluent thought, and spiritually, it governs a sense of security.

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4 - Anahata is related to the thymus, located in the chest. The thymus is an element of the immune system as well as being part of the endocrine system. It is the site of maturation of the T cells responsible for fending off disease and may be adversely affected by stress. Anahata is related to the colours green or pink. Key issues involving Anahata involve complex emotions, compassion, tenderness, unconditional love, equilibrium, rejection and well-being.

Physically Anahata governs circulation, emotionally it governs unconditional love for the self and others, mentally it governs passion, and spiritually it governs devotion.

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3 - Manipura, the Sanskrit name for the Third Chakra, is related to the metabolic and digestive systems. Manipura is believed to correspond to Islets of Langerhans, which are groups of cells in the pancreas, as well as the outer adrenal glands and the adrenal cortex. These play a valuable role in digestion, the conversion of food matter into energy for the body. The colour that corresponds to Manipura is yellow. Key issues governed by Manipura are issues of personal power, fear, anxiety, opinion-formation, introversion, and transition from simple or base emotions to complex. Physically, Manipura governs digestion, mentally it governs personal power, emotionally it governs expansiveness, and spiritually, all matters of growth.

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2 - Swadhisthana, Svadisthana, the Sanskrit name for the Second or the Sacral Chakra is located in the sacrum (hence the name) and is considered to correspond to the testes or the ovaries that produce the various sex hormones involved in the reproductive cycle. Swadisthana is also considered to be related to, more generally, the genitourinary system and the adrenals. The key issues involving Swadisthana are relationships, violence, addictions, basic emotional needs, and pleasure. The color is orange.

Physically, Swadisthana governs reproduction, mentally it governs creativity, emotionally it governs joy, and spiritually it governs enthusiasm.

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1 - Muladhara, the Sanskrit name for the First Chakra, is related to instinct, security, survival and also to basic human potentiality. This center is located in the perineum, which is the region between the genital and the anus. Although no endocrine organ is placed here, it is said to relate to the gonads and the adrenal medulla, responsible for the fight-or-flight response when survival is under threat. There is a muscle located in this region that controls ejaculation in the sexual act of the human male. A parallel is charted between the sperm cell and the ovum where the genetic code lies coiled and the kundalini. Muladhara is symbolized by a lotus with four petals and the color red. Key issues involve sexuality, lust and obsession.

Physically, Muladhara governs sexuality, mentally it governs stability, emotionally it governs sensuality, and spiritually it governs a sense of security.