What is a primary function of the lung meridian?

The primary function of the lung meridian is to control respiration and disperse Qi. This meridian plays a crucial role in the body's ability to exchange gases, allowing for oxygen intake and carbon dioxide removal, which is essential for maintaining life. The lung meridian is connected to the respiratory system and helps regulate the flow of Qi throughout the body, supporting both physical and emotional well-being.

Furthermore, the lung meridian is also responsible for managing the distribution of various forms of Qi, including defensive Qi, which protects the body from external pathogens. This connection to the immune system further emphasizes the importance of the lung's role in maintaining overall health.

In contrast, the other answer choices relate to functions that are associated with different meridians. For example, the regulation of body temperature and hair growth is primarily related to the kidney or spleen meridians. The transportation of nutrients and regulation of moisture are also functions more aligned with the spleen, while muscle movement and strength are mainly governed by the liver and spleen meridians. Understanding the specific roles of each meridian is vital for practitioners of acupuncture and traditional Chinese medicine.