Why are stresses or impacts to the side of the shaft in a long bone more dangerous than stress applied to the long axis of the shaft?

Long bones grow in length from the:

a. diaphyseal line

b. epiphyseal line

c. epiphyseal plate

d. medullary cavity.

Correctly order the following steps of bone growth in length, by placing a 1 by the first step, a 2 by the second step, and so on.

______Calcified cartilage is replaced with bone in the zone of ossification.                   

______Chondrocytes in the zone of proliferation divide by mitosis.                   

______Chondrocytes enter the zone of calcification and die as their matrix calcifies.                   

______Chondrocytes enlarge and cease dividing.

The part of the epiphysis that does not ossify during a person's lifetime is the:

a. articular surface

b.secondary ossification center

c.diaphyseal notch

d.nutrient foramen.

During a skiing accident, Jean-Luc breaks the shaft of his humerus. What is the anatomically correct term for the portion of the bone that he broke?

Osgood-Schlatter disease is a painful condition that affects the proximal end of the tibia (a long bone) just distal to the knee. It primarily affects athletically active children between the ages of 10 and 14. The condition develops when the patellar tendon places strain on this area of the tibia as the area is not as stable as other regions of the bone in children this age. Why would this region not be as stable as other regions of the tibia?