Chapter 6

Place in order the steps involved in the repair of a bone fracture. (1) Osteoblast production of trabeculae and bony callus formation. (2) Formation of a hematoma at the site of fracture. (3) Resorption of remaining bone fragments and remodeling of bone. (4) Migration of fibroblasts to the fracture site. (5) Bridging of broken ends of bones by a fibrocartilaginous callus.

2, 4, 5, 1, 3

Place in order the steps involved in intramembranous ossification. (1) Bony matrices fuse to form trabeculae. (2) Clusters of osteoblasts form a center of ossification that secretes the organic. extracellular matrix (3) Spongy bone is replaced with compact bone on the bone's surface. (4) Periosteum develops on the bone's periphery. (5) The extracellular matrix hardens by deposition of calcium and mineral salts.

2, 5, 1, 4, 3

Place in order the steps involved in endochondral ossification. (1) Nutrient artery invades the perichondrium. (2) Osteoclasts create a marrow cavity. (3) Chondrocytes enlarge and calcify. (4) Secondary ossification center appear at epiphyses. (5) Osteoblasts become active in the primary ossification center.

3, 1, 5, 2, 4

The crystallized inorganic mineral salts in bone contribute to bone's blank, while the collagen fibers and other organic molecules provide bone with blank.

Hardness, Tensile strength

Bone growth in length is called blank growth, and bone growth in diameter (thickness) is called blank growth.

Interstitial, Appositional

Spongy bone differs from compact bone because spongy bone:

Is composed of trabeculae that are oriented along lines of stress

A primary effect of weight-bearing exercise on bones is to:

Maintain and increase bone mass

T/F: Bone resorption involves increased activity of osteoclasts.

True

T/F: The formation of bone from cartilage is known as endochondral ossification.

True

T/F: The growth of bone is controlled primarily by hormones.

True