skeletal system Quiz 6

Question 1

What are the primary bone cell types?

Answer 1

1) osteoblast
2) osteocyte
3) osetoclast

Question 2

Osteoblast

Answer 2

bone forming cell

Question 3

Osteocyte

Answer 3

osteoblast encased in mineralized bone, mechanosensor

Question 4

Osteoclast

Answer 4

bone destroying cell

Question 5

intramembranous ostegenesis

Answer 5

direct, no cartilage intermediary, flat bones

Question 6

endochral ossification

Answer 6

cartilage intermediary, long bones

Question 7

steps for intramembranous ossification

Answer 7

1) ossification center appears in the fibrous connective tissue membrane
2) bone matrix (osteoid) is secreted within the fibrous membrane
3) woven bone and periosteum form
4) bone collar of compact bone forms and red marrow appears

Question 8

growth zone

Answer 8

cartilage cells undergo mitosis

Question 9

transformation zone

Answer 9

older cells enlarge, matrix becomes calcified, cartilage cells die, matrix begins detriorating

Question 10

osteogenic zone

Answer 10

new bone formation is occurring

Question 11

Give the practical observations of Wolff’s law

Answer 11

1. long bones are the thickest midway along the shaft
2. curved bones are thickest where they are likely to buckle
3. spongy bone forms trusses or struts along lines of compression
4. large bony projections occur where heavy, active muscles attach
5. low load conditions (bed ridden, space flight) associated with bone loss

Question 12

Steps involved in bone repair/regeneration

Answer 12

1. hemotoma formation
2. fibocartilaginous callus formation (where you have new blood vessels)
3. bony callus formation
4. bone remodeling