skeletal System

skeletal system is composed of

• bone tissue

• cartilage

• dense connective tissue

• blood

• nervous tissue

functions

• support and protect softer organs/tissues

• provide points of attachment for muscles

• house blood-producing cells

• stores inorganic salts

hematopoiesis

blood cell formation

blood cell production happens where

red bone marrow

red bone marrow produces

red blood cells, white blood cells, and platelets

what does red bone marrow turn into and what is its function

yellow bone marrow and stores fat

calcium homeostatsis

keep the calcium in your blood within a normal range

how many types of bone

5

long bone

longer than wide

short bone

cubed shaped

flat bone

thin, often curved/ flat

irregular bone

complex shape

sesamoid bone

developed with a tendon

compact bone

• dense, soild

• forms outer layersolid

spongy bone

• Known as cancellous

• Looks like honeycomb

hydroxypatite

most abundant salt in bones

osteon

only in compact bone

what do osteons contain

• central canal: blood vessels and nerves

• concretic lamellae: ring of bone matrix

• lacunae: spaces containing osteocytes

• canaliculi: tiny channels connecting osteocytes

spongy bone has

trabeculae

where is red bone marrow?

in the spaces in spongy bone

how many part of a long bone

9

diaphysis

shaft

epiphysis

end

metaphysis

between the epiphysis and diaphysis

epiphyseal plate

growth plate

epiphyseal line

remnant of the growth plate after it closes

articular cartileage

covers the end of bones where joints form

periosteum

outer covering

endosteum

membrane lining internal bone

medullary cavity

contains bone marrow

oestogenic

stem cells that form osteoblasts

oestoblast

build new bone

oestocytes

mature bone cells that maintain bone tissue

oestoclasts

break down bone