Defensive Qi is to Nutritive Qi as:

Defensive Qi, known as Wei Qi, functions to protect the body from external pathogens and is associated with the exterior aspects of the body, such as the skin and immune response. In contrast, Nutritive Qi, or Ying Qi, supports the body's internal functions, nourishing the organs and tissues.

This relationship mirrors the interaction between exterior and interior in TCM concepts. The exterior represents protective and surface-level aspects of the body, while the interior signifies deeper, nourishing functions that sustain health. Just as Defensive Qi operates primarily at the exterior level to fend off external threats, Nutritive Qi works internally to provide sustenance and support to the body’s vital functions.

Thus, the relationship between Defensive Qi and Nutritive Qi is reflective of the broader TCM concept of exterior and interior, where one serves protective roles while the other ensures nourishment and internal balance.