Ossification

What happens during intramembranous ossification?

• dermal tissue is converted to bone

• cartilage is converted to bone

• primary centers of ossification begin to form

• vitamin C helps to make collagen

Where do secondary centers of ossification occur?

• in the marrow cavity in the diaphysis

• along the edges of the diaphysis

• in the center of the epiphyses

• in the dermis of the skin

What does the presence of an epiphyseal line (white line observed on an X-Ray) indicate?

• epiphyseal growth has ended

• epiphyseal growth is just beginning

• growth in bone diameter is just beginning

• the bone is fractured at that area

What is the first step of endochondral ossification?

• blood vessels invade the cartilage model

• osteoclasts make a marrow cavity

• cartilage cells enlarge and calcify

• osteoblasts replace calcified cartilage with spongy bone

What type of ossification is responsible for forming most of the bones of the body?

• intramembranous

• endochondral

What type of bone cell actively makes new bone matrix?

(a)  

What type of bone cell maintains the bone matrix?

(a)  

What type of bone cell dissolves the matrix for calcium metabolism?

(a)  

How would you rank your confidence regarding ossification?

• I'm lost and don't understand much of it.

• I need to do more work and need help.

• I'm getting there but I have some work to do yet.

• I got this! I could explain it to someone else.