Mrs. Debbie Morgan is a 45-year-old female who works as astocking clerk for a local home improvement store. While she was atwork today a large box of metal rivets fell from a 20-ft.-highoverhead shelf, striking her outstretched arm and knocking her tothe ground. The ambulance personnel reported that she had lostquite a bit of blood at the accident scene and was “knocked out”when they arrived. To minimize further hemorrhage, the paramedicsapplied a pressure bandage to her arm.

You meet the paramedics as they bring Mrs. Morgan into theemergency room and begin to assess her for injuries. She is awakeand alert, but complaining of severe left arm and back pain, plusshe has a “killer headache.” To fully examine her injuries youremove four blood-soaked bandages from her arm. You notice a largeopen wound on her arm with what appears to be bone tissue stickingout of the skin. She also has bruises covering her left shoulder,left wrist, and lower back. To determine the extent of her injuriesMrs. Morgan undergoes several x-rays, which reveal thefollowing:

1. Most connective tissue, including bone, is highly vascular.Which anatomical structures in Mrs. Morgan’s compact bone houseblood vessels (2 points)? What sign or symptom inMrs. Morgan’s case is directly related to disruption of thesestructures by her bone fractures (1 point)? How isthe sign or symptom related to these anatomical structures(1 point)?

1. Within days after a fracture, a “soft callus” of fibrocartilageforms. What fibers are found in this type of cartilage (1point)? Identify the cells required for fibrocartilaginouscallus formation and list their functions (2points).

1. As a fracture is repaired, new bone is added to the injurysite. What term is used to describe the addition of new bone tissue(1 point)? Identify which bone cell is responsible for this process(1 point)and explain how it occurs (2points).