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Muscles controlled by the will.
What are voluntary muscles?
Surrounds the muscle as a whole
What is epimysium?
The ability of muscle fibers to lengthen and stretch
What is extensibility?
degenerative process caused by muscle disuse
What is muscle atrophy?
Muscles that are not controlled by the will; receives nerve stimulation from the autonomic nervous system.
What are involuntary muscles?
Wraps several muscle fibers together into fascicles
What is perimysium?
eccentric and concentric muscle contractions
What are isotonic contractions?
The smallest contractile unit of a muscle
What is a sarcomere?
Striated muscles that attach to the bones of the skeleton.
What are skeletal muscles?
The largest and strongest muscle; prime mover
What is an agonist?
When the ends of the contracting muscle are coming closer
What is a concentric contraction?
A method of energy production for muscle contraction that provides quick energy needed for short bursts of activity
What is anaerobic cellular metabolism?
Posture, movement, stabilization of joints, and generation of heat
What are the four functions of Skeletal muscles?
Works in opposition of the agonist
What is an antagonist?
The ends of the contraction are moving farther apart
What is an eccentric contraction?
A muscle attachment that is generally fixed or stabilized during movement
What is the origin?
Connective tissue that organizes muscles into functional groups, surrounds each individual muscle, extends inward throughout the muscle creating muscle bundles, and eventually surrounds each muscle fiber. Projects beyond the ends of the muscle to become tendons or flat tendinous sheaths (aponeuroses) that connect muscles to other structures.
What is fascia?
Muscles that stabilize the proximal or origin end of the prime mover to make movement more efficient
What is a stabilizer or fixator?
Energy molecule produced by mitochondria within cells
What is ATP (adenosine triphosphate)
Muscle fibers that increase with size and thickness
What is hypertrophy?