The Sarcomere and Sliding Filament Theory
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12 Terms
Muscle cells (also called muscle fibers)
are made of bundles of smaller fibers called myofibrils
The myofibrils consist of consecutive contraction units called
sarcomeres
Thick filaments are made of a fibrous protein called
myosin
Thin filaments are made of a protein called
actin
The H zone is the gap between the
thin filaments
thin filaments can
change size depending on if the sarcomere is contracted or relaxed
The A band is the area where _____ are
thick filaments
The A band is
always the length of the thick filaments
The I band is the area where the _____
thick filaments are NOT
The I band
can also change size depending on if the sarcomere is contracted or relaxed
When relaxed, the H zone is ____ than when contracted
larger
Thick filaments are made of ____ and have _____ heads on them
myosin
Note 
Flashcards (43)