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Musculoskeletal system (Functions (Movement, Posture, Stabilise joints,…
Musculoskeletal system
Functions
Movement
Posture
Stabilise joints
Generate heat
Protect and support soft tissues
Store energy and nutrients
Muscle tissue
Smooth
Covers most organs and blood vessels
Not striated
Spontaneous contractions
Little nervous innervation
Mainly hormonal control
Cardiac
Striated
Excitable
Conductive ends
Intercalated discs
Allow for electric continuity
Electrical connection
Cells
Spontaneously active
Pacemakers
Triggered
Skeletal
Structure
Perimysium
Surrounds each fascicle
Endomysium
Surrounds each muscle fibre
Epimysium
Surrounds whole muscle
Characteristics
Excitiability
Contractability
Extensibility
Anatomy
Sarcolemma
Sarcoplasm
Glycosomes
Myoglobin
Sarcoplasmic reticulum
T tubules
Myofibrils
Myofilaments
Myosin (thick)
Actin (thin)
Sacromeres
A band
Overlapping myosin and actin filaments
M line
Middle of band
H band
Myosin
I band
Actin
Z line
Boundary between adjacent sacromeres
Muscle arrangement
Convergent
Pennate
Parallel
Circular
Lever system
Second class
Tip-toeing
Third class
Flexing arm
First class
Nodding
Muscle action
Agonist
Antagonist
Synergist
Fixator