Enkephalin originates from which type of cell?

Enkephalin is a type of endogenous opioid peptide that plays a critical role in modulating pain and is involved in various physiological functions, including stress response and mood regulation. These peptides are synthesized and released by neurons, specifically in regions of the brain and spinal cord associated with pain perception. This origin in neuronal cells allows enkephalins to bind to opioid receptors, effectively reducing the perception of pain and influencing emotional responses.

Muscle cells do not produce neuropeptides like enkephalin; instead, they are primarily involved in contraction and movement. While endothelial cells are crucial for maintaining vascular function and can release various signaling molecules, they do not produce enkephalins. Similarly, immune cells have their specific roles in the immune response and also do not generate enkephalins as part of their function. Thus, the correct association of enkephalin with neurons highlights its role in the nervous system and its significance in neurophysiology.