Intoduction to Skeletal System Flashcards
Major functions of the skeletal system
Support
Protection
Movement
Storage
Blood cell production
a connective tissue that contains collagen, ground substance, and other organic molecules, as well as water and minerals.
Bone
bone compositions form the
Extracellular matrix
classified according to its shape.
Bones
Four classifications of bones
Long bones
Short bones
Flat bones
Irregular bones
Longer than they are wide
Long bones
Has a central shaft, Mostly located on the upper and
lower limbs
Long bones
This shape enhances their functional movement of
the limbs.
Long bones
Long as they are wide.
Short bones
Allows stability and facilitates some movement
Short bones
Relatively thin, flattened shape.
Flat bones
They are well suited to provide strong barrier around
soft organs.
Flat bones
Have shapes that do not fit readily into the other
three categories
Irregular bones
also classified according to its histological structure.
Bones
Bone can either classified into
Conpact bone
Spongy bone
undergo cell division and develop into osteoblasts, which secrete bone extracellular matrix.
Osteogenic cells
Formation of bone by osteoblasts
Bone ossification
Involves the synthesis of an organic matrix containing collagen and proteoglycans and the addition of
hydroxyapatite crystals to the matrix.
Bone ossification
Can be either INTRAMEMBRANOUS or
ENDOCHONDRAL
Bone ossification
Occurs when osteoblasts begin to produce bone in connective tissue membranes
Intramembranous
Primarily happens in skull and clavicle.
Intramembranous
Occurs when osteoblasts begin to produce bone in the hyaline cartilage.
Endochondral
Primarily happens in bones except skull and clavicle.
Endochondral
Involves the removal of existing bone by osteoclasts and the deposition of new bone by osteoblasts
Bone remodeling
Responsible for changes in bone shape, bone repair, adjustment of bone to stress, and calcium ion
regulation
Bone remodeling
