Answer: How Do Bones Heal? In the first few days after a fracture, the body forms a blood clot around the broken bone to protect it and deliver the cells needed for healing. Then, an area of healing tissue forms around the broken bone. This is called a callus.
Explanation:
Heart rate increases in a linear fashion to increases in the intensity of exercise. This is illustrated in the adjacent graph, showing how the heart rate (in beats per minute – bpm) increases to match the incremental demands of walking, jogging and running.