Final answer:
The Proliferative Stage of bone healing, also known as soft callus formation, involves fibroblasts creating collagen and osteoblasts forming spongy bone to temporarily stabilize a fractured bone, leading to the creation of a fibrocartilaginous callus.
Step-by-step explanation:
The Proliferative Stage, also known as the soft callus formation stage, occurs after a bone fracture. When the blood vessels in the broken bone tear and form a hematoma, capillaries grow into it, and phagocytic cells begin to clear away dead cells. Fibroblasts produce collagen fibers to bridge the broken bone ends, while osteoblasts initiate the formation of spongy bone. The fibrocartilaginous callus, composed of hyaline and fibrocartilage, effectively stabilizes the fracture temporarily. With time, this callus is transformed into a bony callus of spongy bone, leading to the ends of the broken bone being firmly joined.