Which back shu point is specifically related to blood?

The back shu point specifically related to blood is BL-17, also known as "Diaphragm Shu." This point is significant in Traditional Chinese Veterinary Medicine (TCVM) as it is directly associated with the Blood system and is considered the influential point for blood. It plays an essential role in aspects related to blood circulation, nourishment, and the overall health of the blood vessels.

In TCVM, blood is not only seen as a transportation medium for nutrients and oxygen but also as a vital substance that supports the function of the organs and the overall health of an animal. BL-17 is pivotal in the diagnosis and treatment of various conditions related to blood deficiency or stagnation, making it crucial for practitioners aiming to restore balance in an animal's health.

Other choices mention back shu points related to different organ systems. BL-16 is linked with the Governing Vessel, BL-15 is associated with the Heart, and BL-18 pertains to the Liver. While each point has its relevance in the context of organ health, BL-17 stands out as the key point related specifically to blood, aligning perfectly with the question's focus.