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10 terms

Muscle Contraction

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Muscle cells
Long, have bundles of myofibrials
Myofibrials
Part of muscle cells, made up of repetive units called sarcomeres
Sarcomeres
Make up myofibirals and are where contractions happen
Z-lines
Seperate each sarcomere
A Bands
Thick myosin filaments (red)
I bands
Thin actin filaments (blue)
H zone
Space between actin filamints
Contracted sarcomere
Shorter, H zone becames smaller
Sarcomere shortens
The thick filiments (myosin) pull the thin filaments (actin) twards the H zone. When the pull occurs, the Z lines are pulled in and causes the s
arcomeres to shorten.
Muscle fibers shorten
When several hundred of these sarcomeres shorten