Exam 3- Bone Flashcards Preview

Anatomy And Physiology I > Exam 3- Bone > Flashcards

Flashcards in Exam 3- Bone Deck (17):
1

ECM

Hard and Calcified (mineralized)

2

Bone

Rigid, supportive & protective

3

Inorganic Salts

hydroxyapatite: Crystals of Ca and P
(slender, needlelike crystals)
(oriented to resist stress)

4

Other Minerals in Bone Matrix

Mg, Na, S, and Fl

5

Organic Matrix (of bone)

Collagen fibers
Ground substance (composed of proteins and polysaccharides, secreted by osteroblasts)

6

Osteoblasts

Bone building cells, small, found in all bone surface. Sythesize and secrete osteoid. Collagen in the osteoid provide a framework for the deposition of hydroxyapatite.

7

Osteocytes

Mature, nondividing osteroblasts. Lie within the lacunae. Responsible for the erosion of bone minerals, contains large numbers of lysosomes

8

Compact Bone

Composed of cylinder shapes units called osteons

9

Central Canal

Extend lengthwise through the osteon, contains blood vessels, connected by transverse canals

10

Lamellae

Layers (rings) of calcified matrix (between lacunae) Concentric, interstitial (in between rings), circumferential

11

Lacunae

Small Spaces containing cells

12

Osteoclasts

Giant, multi-nucleated cells. Responsible for the erosion of bone minerals, contains large numbers of lysosomes

13

Canaliculi

ultra-small canals connecting lacunae

14

Cancellous Bone

Spongy bone. Formed by trabeculae. Beams of bony tissue. No osteons. Arranged along lines of stress

15

Bone Marrow Characteristics

Myeloid Tissue- soft, diffuse connective tissue. Site for Hematopoiesis, contain hematopoietic stem cells.

16

Red Marrow

Found in virtually all bones in children. Provides red blood cells. Adult bones that still contain red marrow :Ribs, vertebrae, humerus, pelvis and femur

17

Yellow Marrow

Red marrow is replaced by yellow marrow with age. Cells are activated and become saturatred w/ fat. Yellow can change to red in special circumstances