What is a key function of the CB2 receptor?

The CB2 receptor plays a crucial role in the body's immune system and is primarily found in peripheral tissues, particularly in immune cells and bones. This receptor is part of the endocannabinoid system, which is involved in regulating various physiological processes, including immune response and inflammation.

CB2 receptors are predominantly expressed on cells associated with the immune system, such as B cells, T cells, and macrophages. This expression suggests their involvement in modulating immune responses and maintaining homeostasis in the body. Additionally, they are also found in other tissues, including the skeletal system.

The other options do not apply accurately to the function of the CB2 receptor. For instance, the psychoactive effects of cannabis are primarily mediated by the CB1 receptor, which is mainly found in the central nervous system. While the CB2 receptor is present in the brain, it is primarily associated with non-psychoactive roles. Finally, the assertion that the CB2 receptor does not affect immune response contradicts its known function in mediating immune system activity. Thus, the functional role of the CB2 receptor in immune cells and bones is significant and directly aligns with the correct response.