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Muscular System
Functions of the muscular system
Voluntary movement
Involuntary movement
Protection of internal organs
Three types of muscle tissue
Skeletal muscle tissue is attached to
bones and causes movements of the
body.
Also called striated muscle or
voluntary muscle
Three types of muscle tissue
Cardiac muscle is responsible for the
rhythmic contractions of the heart.
Cardiac muscle is involuntary = it
generates its own stimuli to initiate
muscle contraction.
Three types of muscle tissue
Smooth muscle lines the walls of
hollow organs. (ie: blood vessels and
the digestive tract)
Smooth muscle contraction is
relatively slow and involuntary
Structure of the Skeletal Muscle
Fascia
Covering of
muscle
Become tendons
(only in skeletal
muscle)
Structure of the Skeletal Muscle
Myofibrils
Muscle fibers
Contraction
In all muscle
types
Structure of the muscle
Two key filaments that make up
myofibrils
1. Actin is a thin filament involved in
contraction.
2. Myosin is a thick filament involved
in contraction
Connective tissue covering of
skeletal muscle
Muscle Fatigue
Oxygen Debt
Oxygen debt is defined as the extra
amount of oxygen that must be
taken in by the body for cellular
processes, and it represents the
difference between the amount of
oxygen needed for totally aerobic
muscle activity and the amount
actually used.
Muscular system vocabulary
Peristalsis
Myopathy
RICE (acronym)
Muscle tone
Isotonic
contractions
Isometric
contractions
ATP
Anaerobic
glycolysis
(anaerobic
respiration)
Aerobic
respiration
Rigor mortis
Origin
(attachment)
Insertion
(attachment)
Diseases/conditions
Myasthenia gravis
Disuse atrophy
Duchenne Muscular dystrophy (DMD)
Hernia
Myofascial pain syndrome
Spasm
Cramp
Strain
tetanus