Final answer:
The action of platelet-derived growth factor is to stimulate the production of fibroblasts.
Step-by-step explanation:
The action of platelet-derived growth factor is to stimulate the production of fibroblasts. Fibroblasts are connective tissue cells that play a crucial role in wound healing and tissue repair. They are responsible for producing extracellular matrix components, such as collagen, which are essential for tissue formation and remodeling.
Platelet-derived growth factor (PDGF) is a signaling molecule released by platelets and other cells. It acts as a mitogen, triggering cell division and proliferation in fibroblasts, smooth muscle cells, and other cell types involved in tissue repair processes.
Other cells, such as red blood cells (a), white blood cells (b), and neurons (d), are not directly stimulated by platelet-derived growth factors.