Which organ corresponds to Yin within Yang?

The correct answer is the Lung, as it embodies the concept of Yin within the framework of Yang. In Traditional Chinese Medicine (TCM), the organs are associated with various Yin and Yang qualities, and the Lung is considered to represent a more Yin aspect, especially since it governs the nourishment and distribution of Qi (vital energy) throughout the body.

The Lung plays a vital role in the body's overall equilibrium. It is associated with the element of Metal and is responsible not just for respiration, but also for regulating fluid metabolism and facilitating the movement of Qi throughout the body. In this context, the Lung can be seen as being more Yin in nature, reflecting its role in filtering and enriching air into the body, which involves receiving and storing, typical of Yin functions.

Understanding the balance of Yin and Yang within the various organs is crucial in TCM, as health is often viewed as the harmonious interaction between these two forces. The distinction of the Lung as Yin within Yang highlights its foundational role in supporting Yang functions while maintaining a nourishing and stabilizing presence within the body’s energetic system.