7.4

Question 1

bone remodeling

Answer 1

ongoing replacement of old bone tissue with new bone tissue

Question 2

osteoclasts

Answer 2

remove minerals and collagen

Question 3

osteoblasts

Answer 3

deposit minerals and collagen

Question 4

during resorpiton

Answer 4

osteoclasts release enzyme acids

Question 5

enzymes

Answer 5

digest collagen and organic substances

Question 6

acids

Answer 6

dissolve mineral salts

Question 7

what does remodeling and growth depend on

Answer 7

all modeling and growth depends on growth factors

Question 8

what is a fracture

Answer 8

and break in the bone

Question 9

what happens when you get a fracture

Answer 9

blood supply is decreased slowing repair

Question 10

why does cartilage take longer to heal

Answer 10

lack of blood supply

Question 11

what happens 6-8 hours after an injury

Answer 11

forms a clot called fracture hematoma
-swelling and inflammation occur

Question 12

osteoclasts

Answer 12

begin to remove damaged tissue (several weeks)

Question 13

osteoprogenitors

Answer 13

invade the hematoma

Question 14

fibroblasts

Answer 14

produce collagen fibers help connect broken bone ends

Question 15

What do chondroblasts do

Answer 15

produce cartilage

Question 16

how many weeks does it take to bridge bone

Answer 16

3

Question 17

osteoblasts begin to

Answer 17

produce spongy bone trabeculae
-join living and dead portions of original bone
-lasts 3-4 months
-remodeling of new spongy bone
-dead bone fragments are resorbed by osteoclasts
-compact bone replaces spongy bone at edge of fracture

Question 18

what are the different types of fracture (8)

Answer 18

-Partial (complete): break across the bone is incomplete
-complete: break across the bone is complete
-simple: bone does NOT break through the skin
-compund: Broken ends protrude through the skin
-Greenstick incomplete: Occurs on bend of bone (common in children)
-comminuted complete: fragments the bone (mult pieces/ surgeury car accidents)
-fissure incomplete: logitudinal break (more rare)
-oblique: diagonal/ slanted break
-spiral: caused by twisting bone excessively
-transverse: perpendicular break