Non-Excitable Cells
These are cells which cannot propagate action potential.
Fibroblasts
These are connective tissue cells. They are located in the interstitial space between myocytes, providing structure and support for the heart muscle.
Adipocites
These cells make up the fat layer that surrounds and cushions the heart.
These are cells that line the inside of arteries, veins and form the walls of capillaries. Though initially thought that these cells served no particular purpose, it has been recently shown that these cells release special chemicals which can affect other cells within the vessel wall (smooth muscle cells) and cells in the blood stream.
