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Skeletal Muscle Review
Key terms
16
Anatomy
Undergraduate 2
05/16/2008

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Term
Muscle
Definition
 Structure that aids in movement of the body and its parts
Term
Excitability or irritability
Definition
 Ability to receive a stimulus from some other source which can be a charged ion.
Term
Myoglobin
Definition
Oxygen binding protein stored inside muscle cell
Term
H Zone
Definition
Area in A band with no thin filaments
Term
Z disc  
Definition
Bisects the I band made of connecting proteins; Anchors thin filaments; connects myofibrils throughout the muscle
Term
Sarcoplasmic Reticulum 
Definition
SER functions to regulate Calcium in muscle tissue; releases and reuptate of calcium in and out of sarcoplasm
Term
Sliding Filament Theory
Definition
During contraction the thin filaments slide past the thick filaments so that the actin and the myosin will overlap to a greater degree. Ina relaxed muscle, the actin and the myosin only overlap slightly.
Term
First step of muscle fiber contraction
Definition
cross bridge attachment
Term
Cross Bridge Attachment
Definition
Expose of Binding sites, therefore the myosin attach
Term
Second step during muscle fiber contraction
Definition
Power Stroke
Term
Power Stroke
Definition

Myosin heads pivot which slides the actin toward the M line.

  • Shortening of Z line
  • shortening of sarcomere
  • closing of H zone 
Term
myoneural junction
Definition
the axon of a motor neuron ends at the muscle fiber by ionic electrical impulse
Term
action potential
Definition

on switch to stimulate muscle contraction

  • nerve sends signal to neuromuscular junction
  • ACh binds to receptors of sarcolemma
  • opening of NA+ channels -> Na+ influx = diffusion 
Term
Refractory Period
Definition
Time between repolarization to adjacent areas of sarcolemma
- activates Na+ K+ pump to restore sarcolemma resting state
Term
Motor Unit
Definition
Motor neuron + muscle fibers
Term
Muscle Twitch
Definition
single muscle cell contraction or action potential
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