By 3 to 7 days, these
cells differentiated into myofibroblasts that
secreted abundant extracellular matrix proteins and expressed smooth
muscle α - actin to structurally support the necrotic area.
They are a communication system for the body, similar to the nerve impulse messages that move our
muscles, but rather than through nerves, the message is sent
by the endocrine glands
secreting hormones, sending them from one set of
cells to another.