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Fibrous connective tissue that surrounds fascicles

Elasticity of muscle

the ability to recoil and resume the original resting length

Glycolysis-lactic acid (anaerobic) system

No oxygen required in muscles for short amount of time, breaks down glucose to substitute oxygen

Fast glycolytic muscle fibers

Fastest muscle type in humans, contracts with great force, but can only sustain short anaerobic bursts

Motor end plate

Specific part of the sarcolemma that contains ACH receptors

Unfused tetanus

Relaxation time between twitches gets shorter while the strength of contraction amplifies

What is anchored in the Z discs

Thin filaments

Concentric Isotonic contraction

Muscle shortens and does work

Isometric contraction

Increasing muscle tension (muscle does not shorten)


Fine sheath of connective tissue composed of teticular fibers surrounding each muscle fiber

Creatine phosphate system

a rapidly mobilizable reserve of high energy phosphates

Muscle twitch

Response of a muscle to a single brief threshold stimulus

What travels down T tubules

impulses to the deepest regions of the muscle

Sliding filament mechanism

Thin filaments slide past thick ones, myosin binds and detaches several times during contraction

Troponin and Tropomyosin

Regulatory subunits bound to actin

Cross bridge

two small light polypeptide chains

Type of proteins that are actin and mysoin in skeletal muscle

Filament forming protiens

Filaments that have active sites

Thin filaments

Ion troponin binds to


fused tetanus

Smooth sustained muscle contraction

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