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15 Cards in this Set

  • Front
  • Back
What is a muscle fiber?
A muscle cell
Muscle cells are also called by what name?
Muscle fibers
What is a sarcomere?
The functional unit of a muscle fiber. It extends from one Z disc to the Z disk of an adjoining sarcomere.
Which filament is thick in a myofibril?
Myosin
Which filament is thin in a myofibril?
Actin
Where is the M line found?
In the middle of the A band
What is the A band?
The band that extends the full length of myosin.
What is the H band?
The region between two actin fibers.
What is the I band?
The region between two myosin fibers?
Where is the Z line found?
At the center of the I band.
What composes a motor unit?
Skeletal muscle cells and the single neuron that innervate them.
What is the neurotransmitter found in a motor unit?
ACh
What is the function of a muscle spindle?
Monitor the length and changes in length (tension) of muscles.
What are some characteristics of cardiac muscle?
1) Involuntary action
2) Intercalated discs
What are some characteristics of smooth muscle?
1) No striations
2) Spindle-shaped cells