The Five Elements and Yin and Yang

The fundamental energies alive in nature and always in motion are the Five-Elements - Wood, Fire, Earth, Metal and Water.

The Five-Element Theory states that the five major Organ Systems (Liver/Gallbladder, Heart/Small Intestine, Spleen/Stomach, Lung/Large Intestine, and Kidney/Urinary Bladder) are each related to a particular element.
Each element generates, or gives energy to, another. Each element also restrains or controls another.

TCM understands that everything is composed of two complementary energies; one energy is Yin and the other is Yang. They are never separate; one cannot exist without the other. This is the yin/yang principle of interconnectedness and interdependence; it is not oppositional.

According to the Theory of Yin and Yang, male is yang; female is yin.
Ideally, yin and yang should always remain in harmony, not just in balance.

The Philosophy of Yin and Yang

http://www.sacredlotus.com/theory/yinyang.cfm