Myofibroblast cells are best described as a combination of...

• A. Combination of fibroblasts and smooth muscle
• B. Pure fibroblasts
• C. Pure smooth muscle
• D. Osteoblasts

Answer: (A)

Myofibroblasts are hybrid cells that combine the matrix-producing features of fibroblasts with the contractile properties of smooth muscle. In tissue repair, fibroblasts differentiate into myofibroblasts and begin expressing contractile proteins such as α-smooth muscle actin, enabling them to generate tension and contract the wound edges. At the same time, they continue to secrete extracellular matrix components like collagen, supporting tissue restoration. This dual capability— ECM production plus contractility—best fits describing them as a combination of fibroblasts and smooth muscle. They aren’t just fibroblasts (lacking strong contractility), nor pure smooth muscle (not primarily forming repair matrix), and they aren’t osteoblasts (bone-forming cells).