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Basic structure of Skeletal Muscle (Functions (support soft tissue,…
Basic structure of Skeletal Muscle
Functions
support soft tissue
encircle openings of digestive and urinary tracts
maintain posture and body position
heat production
convert chemical energy to force or mechanical work
reservoir for protein storage
Skeletal Muscle Actions
Agonist (prime mover of any skeletal muscle) / Antagonist (act on the same joint to produce opposite movement)
Sphincter (constrict an opening)
Abductor / Adductor (moving limb to and away from body)
Flexor / Extensor (angle at joint)
Muscle Fibre
Types:
Slow twitch:
Slow oxidative
#
Fast Twitch
2A: Fast Oxidative Glycolytic
2B:
only in specialised cells
2X: Fast Glycolytic
#
Components:
myofilaments (protein filaments)
myofibrils
sarcoplasm: cytoplasm
nucleus
Sarcolemma (cell membrane)
Satellite cells: mononucleated stem cells located between sarcolemma and basement membrane. Responsible for growth and repair
red fibres: high myoglobin and mitochondria content
white fibres: low myoglobin and mitochondria content