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20 Cards in this Set

  • Front
  • Back
Release of calcium from sacroplasmic reticulum
Muscle contraction caused by
Calcium binds to this
Troponin moves tropomysin to expose...
binding sites on thin filaments
Attaches to binding sites
Helically-arranged myosin heads of thick filament
Myosin heads pivot to do what...
move cross-bridged thin filaments towards the center of the sarcomere
ATP bonds with myosin heads to break what...
cross-bridge and return myosin to pre-pivot position
Myosin head now does what...
cross-bridge further along thin filament
When stimulation ends, this occurs...
calcium returns to the terminal cisternae
Motor unit consists of
one motor neuron and all the muscle fibers that it innervates
Motor unit traits
Muscles include a number of motor units
Means for regulating the strength of contraction
Stimulation is all-or-nothing; the motor neuron transmitting the impulse will stimulate all fibers it innervates
Where impsule reaches individual nerve fiber
Neuromuscular junction
Release of acetylcholine at the junction does what?
Stimulates the sarcoplasmic reticulum to release calcium.
Skeletal muscle types
Fast skeletal muscle characteristics
Large diameter
Densely packed myofibrils
Relatively few mitochondria
Called white fibers due to lack of myoglobin
Majority of skletal muscle fibers in the body
Intermediate skeletal muscle characteristics
Resemble fast fibers
Greater resistance to fatigue
Slow skeletal muscle characteristics
Smaller diameter
Contract more slowly
Called red due to myoglobin
Cardiac muscle fibers are
arranged in thick bundles within the heart wall
Cardiac muscle have how many nuclei
one to two
Cardiac muscle is different to skeletal muscle in...
number of nuclei
shorter and thicker
Intercalated discs
Y-shaped branch junctions of cardiac muscle fibers joined to adjacent muscle fibers