How do broken bones heal?

What causes most broken bones?

• Too little blood flow to the bone.

• Too much stress placed on a bone.

• A muscle or tendon detaching from a bone.

• A lack of marrow inside a bone.

What is the major difference between a closed fracture and an open fracture?

• In a closed fracture, the bone doesn't break the skin; in an open fracture, it does.

• In a closed fracture, the bone breaks all the way through; in an open fracture, it doesn't

• In a closed fracture, the bone breaks the skin; in an open fracture, it doesn't

• In a closed fracture, the bone doesn't breaks all the way through; in an open fracture, it does

What might cause a stress fracture? Choose the best answer.

• A sudden fall from a tree

• A heavy object landing on your feet

• Too much physical activity over a long period of time

• Being involved in the car accident

What happens immediately after a bone breaks?

• The end of each piece of bone becomes brittle and dies

• The bone begins producing new tissue to bind the break

• Marrow from inside the bone begins leaking into the break

• Nothing happens, so the bone has to be glued together by the doctor

What can you infer about x-rays from the information presented in the movie?

• They help doctors identify the location and severity of fractures

• They help bones heal

• They are useful in healing simple fractures, but not of compound fractures

• They are rarely used when patients have broken bones

Why do doctors use casts to repair broken bones?

• Medicine inside the cast helps the bones heal

• The cast immobilizes the bone so they mend properly

• The cast gives patients a greater range of mobility

• The cast prevents other bones from breaking

In the movie, Tim says that kids' bones are more pliable than adults'. What is the best synonym for "pliable?

• hard

• small

• brittle

• flexible

How can older adults avoid osteoporosis?

• By making sure they don't put too much stress on their bones

• By consuming plenty of calcium and vitamin D

• By avoiding all physical activity

• By consuming plenty of red meat

Which of the following types of fractures has the greatest chance of not healing properly?

• A greenstick fracture

• A stress fracture

• A compound fracture with an infection at the site of the break

• A closed fracture