The Sun, while not a planet, is the largest body in our Solar System and therefore defines the dominant traits of your personality according to the zodiac sign it falls in. It is associated with your spine and heart. 

The Moon embodies your emotions. Physically, it is associated with your digestive system and breasts. 

Mercury is associated with your intellect and communication skills. It also coordinates your nervous system and respiratory system. 

Venus rules love, relationships, and beauty. Physically, it governs the lumbar region, throat, and kidneys. 

Mars is your power, aggressions, and initiative. It is associated with your kidneys, gonads, and red blood cells. 

Jupiter is usually your luck and expansiveness; it is known as being a "social" planet. It governs the liver. 

Saturn represents your issues and challenges in this lifetime. It is associated with your skin, teeth, bones, gall bladder, and spleen. 

Uranus defines your individuality. Physically, it looks over the circulatory system and sudden health changes. 

Neptune governs spirituality and creativity. Its physical properties include mental and nervous processes, and drug use. 

Pluto embodies your reaction to change and transformation. It is associated with reproduction and the unconscious. 

There are two other strong influences in your chart, although they are not planetary bodies. Your Ascendant, or Rising Sign is the point on your chart that was at the horizon when you were born; it is represented by the line just between the Twelfth and First Houses. Your Ascendant is your approach to life and is analyzed using the zodiac sign it falls in. 

 Lastly, the Midheaven is the point overhead when you were born. Its corresponding zodiac sign describes the outward expression of your individuality and ego, especially of how you influence the world.