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What are CHARACTERISTICS of muscles?
- - Viscoelasticity
The ability to react to stimuli
The ability to develop tension
The ability to be stretched
The ability to return to normal after being stretched or shortened
Enables muscle to stretch greater over greater time
How much hamstring flexibility should one have?
The more hamstring flexibility you have, the further you can go (rubberband example)
What are the functions of muscles?
- Impart motion
- Maintain posture
- Generate heat
The ability of a muscle or group of muscle to produce a force in one maximum effort
What are the types of muscle?
Non-striated and involuntary; found in the walls of organs
Striated and voluntary; stimulated by the somatic nervous system; moves bones; always pull and never push
Striated and involuntary; found in the walls of the heart
What are the types of contraction?
- Concentric (isotonic)
- Eccentric (isotonic)
Muscle contracts but does not change length (pushing hands together)
"Myofibers" = muscle cells
The functional unit of a muscle; consists of a motor neuron and the muscle fibers (anywhere from 2-100s) it controls
Connective tissue covering individual muscle fibers
Connective tissue that covers a group of fibers (fiber bundles)
The covering of the entire muscle
Usually the proximal end of the muscle, which remains fixed during muscular contraction
Usually the distal end of a muscle, which is movable
The meeting of a muscle and its tendon
Types of skeletal muscle
Long slender muscle; fibers run parallel to muscle belly; example: sartorius
Half feather appearance (based on the arrangement of the fascicles); example: flexor pollicis longus
Whole feather appearance (based on the arrangement of the fascicles); example: gastrocnemius and biceps brachii
Multiple feather structures; example: deltoid
Prime mover; primarily responsible for movement; muscle MOST involved
Resist prime mover's action and cause movement in the opposite direction of the prime mover; control speed, protect joint
Assist prime mover; prevent unwanted movement in intermediate joints; example: wrist flexors/extensors stabilize the wrist while ti digit flexors/extensors work
Stabilize to prevent unwanted movement (if you're doing elbow flexion, the deltoid stabilizes to prevent shoulder flexion); contract isometrically in order to stabilize
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