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skeletal (skeletal system/ tissues (major functions (support, assistance…
skeletal
skeletal system/ tissues
major functions
support
assistance in movement
protection
mineral storage
blood cell formation
energy storage
major structural components
bone- connective tissue- all cells & extracellular matrix- collagen (strength and flexibility)
65% inorganic - minerals - hardness
bone types
compact bone
spongy bone
long bone
a bone longer than its width
components
epiphyses- top/ bottom part of bone
epiphyseal line- line between head and body of bone
diaphysis- shaft/ body
bone cells
osteogenic- stem cells
creates osteoblasts
osteocyte
in lacuna- located in bone tissue- function to maintain healthy bone tissue
osteoclast
fusion of several leukocytes
osteoblast
creates extracellular matrix
bone marrow
red
blood cell formation
gelatinous, soft tissue
as a fetus bones all filled with red
after 7 months red bone marrow remains in axial bones
yellow
adipose- nutrient storage
skeletal muscles
functions
produces movement
opens and closes body passageway
sphincter muscles
maintain posture and stabilizing joints
generates heat
properties
contractility
excitability
extensibility
elasticity
connective tissue layer
epimysium-perimysium-endomysium
components of skeletal fiber
sacrolemma-myofibrils-mitochondria-sarcoplasmic reticulum-transverse tubule
joints
fibrous joints
very short interconnecting fibers
suture
skull only
syndesmosis
little movement-DRCT
gomphosis
tooth meets alveolus
cartilaginous joints
synchrdrosis
hyaline cartilage found where ends of bones meet
symphysis
pubic symphysis & intervertebral joint
slightly moveable
synovial joints
components
hyaline cartilage-joint capsule- joint cavity-bursae
structural types
plane joint
hinge joint
pivot joint
condylar joint
saddle joint
ball and socket joint