Test 2 Flashcards
(22 cards)
bHLH
Basic helix loop helix. Structural region on MyoD that is required for activity
E box
Binding site in DNA for myogenic factors
Excitation-contraction coupling
Physiological process of converting an electrical stimulus to the muscle into a contraction
Myogenic
Muscle
Power stroke
Molecular interactions between actin and myosin that lead to muscle contraction
Sarcolemma
Plasma mem of skeletal muscle cells
Satellite cells
Stem cells found in skeletal muscle fibers that promote repair and regeneration
SERCA
Sarcoendoplasmic reticulum calcium ATPase. Pump located in sarcoplasmic reticulum (SR) that transports Ca2+ from cytoplasms into SR
Summation contraction
Short duration contraction caused by consecutive action pot
Tetanus contraction
Steady, prolonged contraction caused by continuous stimulation
Twitch contraction
Single muscle contraction caused by one action pot
Active tension
Force generated by formation of actin-myosin crossbridges
Cachexia
Dramatic muscle atrophy seen in patients with chronic illness
Isometric contraction
Length constant, tension changes
Isotonic contraction
Tension constant, length changes
Motor unit
Single motor neuron and all muscle fibers it in rebates
Myopathy
Disease of skeletal muscle not caused by nerve disorders
Myositis
Inflammation of skeletal muscles
Passive tension
Force generated by stretching muscle
Rhabdomyolysis
Rapid destruction of skeletal muscle cells
Sarcopenia
Age related reduction in skeletal muscle mass and strength
Total tension
Force generated by both crossbridge formation and stretching muscle
