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Chapter 9 (2)

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Perimysium
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)
Endomysium
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
Calcium
fused tetanus
Smooth sustained muscle contraction