Bone development pt 3

Question 1

Lysosomal enzymes (digest organic matrix)
 Acids (convert calcium salts into soluble 
forms)

Answer 1

Bone Resorption (dissolved blood)

Question 2

What controls continual remodeling of bone?

Answer 2

1. Hormonal mechanisms that maintain blood
   calcium levels
2. Mechanical and gravitational forces

Question 3

Bone fractures may be classified by four “either/or”

classifications:

Answer 3

1. Position of bone ends after fracture:
   • Nondisplaced = ends retain normal position
   • Displaced = ends out of normal alignment
2. Completeness of the break
   • Complete = broken all the way through
   • Incomplete = not broken all the way through
3. Orientation of the break to the long axis of the bone:
   • Linear = parallel to long axis of the bone
   • Transverse = perpendicular to long axis of the
   bone
4. Whether or not the bone ends penetrate the skin:
   • Compound (open) = bone ends penetrate the skin
   • Simple (closed) = bone ends do not penetrate the
   skin

Question 4

Common Types of Fractures

Answer 4

Location
• External appearance
• Nature of the break

Question 5

• Calcium salts not deposited
• Rickets (childhood disease) causes bowed
legs and other bone deformities
• Cause: vitamin D deficiency or insufficient
dietary calcium

Answer 5

Osteomalacia and rickets