Module 4 Flashcards
Hemopoisis
production of WBCs, RBCs and platelets from red bone marrow (connective tissue)
Red bone marrow
found in bone; produces RBCs, WBCs and platelets
Yellow bone marrow
found in bon; consists of adipose cells and acts as chemical energy reserves;
as you age, red bone marrow turns into yellow bone marrow
Diaphysis
1/7 part of long bone; bones shaft/body; the long cylindrical portion of bone
cavity contains yellow bone marrow
covered by peristoneum
Epiphysis
1/7 part of long bone; distal and proximal end of bone
spongy bone contains red bone marrow
covered by articular cartilage
Metaphysis
1/7 part of long bone; region in MATURE bone where diaphysis and epiphysis join
in GROWING BONE: each metaphysis contains epiphyseal (growth) plate which is replaced by bone when growth stops
Articular Cartilage
1/7 part of long bone; thin layer of hyaline cartilage; covers epiphysis where bone forms joint to reduce friction and absorb shock
Periosteum
1/7 part of long bone; tough connective tissue that surrounds bone surface where there is NO articular cartilage
enables bone to grow in diameter/thickness
protects bone from fracture and nourishes tissue
Medullary Cavity
1/7 part of long bone; aka marrow cavity; hollow space within diaphysis that contains fatty yellow bone marrow (in adults)
Endosteum
1/7 part of long bone; thin membrane lining of medullary cavity that contains single layer of bone forming cells
Calcification
process where mineral salts that are deposited into collagen framework of matrix begin to harden
Osteogenic cells
1/4 cells present in bone tissue; unspecialized stem cell deriving from mesenchyme
**only bone cell to undergo cell division
found along inner portion of periosteum
resulting cell= osteoblasts
Osteoblasts
1/4 cells present in bone tissue; “blasts”=secrete matrix
needed to build extracellular matrix of bone tissue
become trapped in matrix secretions and become osteocytes
Osteocytes
1/4 cells present in bone tissue; mature bone cells that maintains bone tissues daily metabolism (exchange of nutrients and wastes)
Osteoclasts
1/4 cells present in bone tissue; huge cells derived from 50+ monocytes (WBC)
release lysosomal enzyme and acids that digest protein and mineral comps of matrix (resorption)
Resorption
normal part of development, growth and maintenance and repair of bone where lysosomal enzymes and acids digest protein and mineral comps of matrix
Haversian system/Osteons
repeating structural units within compact bone
Haversian Canal
channel that contains blood vessels, nerves and lymphatic vessels running longitudinally in compact bone
Concentric lamellae
surround haversian canals in compact bone; ring of hard calcified extracellular matrix; diffusion through is very slow
Lacunae
found between lamellae in compact bone; contain osteocytes
Compact bone tissue
strongest type of bone tissue; makes up bulk of diaphysis
found beneath peristoneum of all bones
provides support, protection and resistance against stresses produced by weight and movement