Muscle Types
This type of muscle is voluntary and attached to bones.
Skeletal muscle
The thick filament that pulls during contraction.
Myosin
Movement that decreases the angle of a joint.
Flexion
This common injury occurs when muscle fibers are overstretched or torn.
Muscle strain
Muscle that flexes the elbow.
Biceps
All muscle tissue shares this primary function.
Contraction
Theory explaining how muscles shorten.
Sliding filament theory
Movement away from the midline.
Abduction
Inflammation of a tendon caused by overuse.
Tendonitis
If calcium is not available in the muscle fiber, this process cannot occur.
Muscle contraction
This muscle type moves substances through organs like the intestines.
Smooth muscle
This type of contraction shortens the muscle.
Concentric contraction
Movement that points the toes downward.
Plantar flexion
This condition involves progressive muscle weakness due to genetic causes.
Muscular dystrophy
Muscle group that extends the knee.
Quadriceps
This muscle type is striated but involuntary.
Cardiac muscle
A lack of ATP after death causes this sustained contraction.
Rigor mortis
The muscle that is the prime mover of an action.
Agonist
Condition causing widespread muscle pain and fatigue without tissue damage.
Fibromyalgia
This type of contraction produces tension without changing muscle length.
Isometric contraction
This muscle type is non-striated and involuntary
Smooth muscle
This is required for myosin to release actin.
ATP
Muscle that assists the prime mover.
Synergist
This condition results from breakdown of muscle tissue, often after extreme exertion.
Rhabdomyolysis
This structure is the smallest functional unit of muscle contraction.
Sarcomere