How Do Vasoactive Substances Function in Histology?
In histology, the study of tissues, vasoactive substances are essential for understanding the dynamic interactions within the vascular system. Endothelial cells lining blood vessels produce and respond to these substances, regulating vascular tone and permeability. For instance, nitric oxide diffuses from endothelial cells to smooth muscle cells, causing relaxation and vessel dilation. Conversely, endothelin binds to receptors on smooth muscle cells, triggering contraction and vessel narrowing.
