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SkeletalSystemAlyssaMiller (skeletal muscles (components of skeletal…
SkeletalSystemAlyssaMiller
skeletal muscle/tissues
function
support
movement
protection
mineral storage
blood cell formation and energy storage
metabolism of energy
structural components
extracellular matrix
osteocytes- bone cells
osteogenic cells- produce stem cells
osteoblasts- produce bone matrix
osteoclasts- break down bone
compact bone/spongy bone
compact bone
characteristics
external layer of bone
features
support
strength
spongy bone
characteristics
internal bone
features
trabeculae- storage of yellow and red bone marrow
mineral/calcium storage
joints
fibrous joints
immovable joint connecting bones with collagen fibers
cartilaginous joints
immovable joint connecting bones with cartilage
synovial joints
6 structural components
plane
gliding movement
hinge
flexion/extension
pivot
rotation movement
condylar
flexion/extention
adduction/abduction
saddle
adduction/abduction
flexion/extension
ball-and-socket
flexion/extension
adduction/abduction
rotation
components
freely moving capsule joint filled with synovial fluid
skeletal muscles
functions
movement
opening and closing of passageways
maintaining posture and stabilizing
production of heat
properties
contractibility: shortening of muscle cells
excitability: impulses initiating contraction
extensibility: stretch of muscle tissue
elasticity: recoiling of muscle tissue
components of skeletal muscle fibers
I Band- thin filaments
H Zone- thick filaments
M Line- thick filaments linked together
myofibril
Z Disk: countries at the ends of sarcomeres
connective tissue layers
Outermost layer: epimysium- DICT surrounding the muscle fiber
fascicle: bundled appearance composed of many fibers within the muscle
perimysium: surrounding a fascicle
endomysium: sheath of loose connective tissue around muscle fibers in a fascicle
components of the neuromuscular junction
neurotransmitter goes through the synaptic clefts and binds to receptor molecules, where a signal is transferred and a muscle fiber is contracted