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Muscles move __ by __.
Muscles alwaays __; they can __.
Ability to move a body part in opposite directions requires that __.
- skeletal parts; contracting
- contract actively; extend only passively
- muscles be attached to the skeleton in antagonistic pairs
Each fiber is a what?
How many kinds of myofilaments are found in each myofibril?
- single cell with many nuclei (results from cell fusion); consists of bundles of smaller myofibrils arranged longitudinally
consist of two strands of actin and one strand of regulatory protein coiled together.
staggered arrays of myosin molecules
Sarcomere = Unit of organization of skeletal muscle ("unit of contraction").
the borders of the sarcomere; aligned in adjacent myofibrils.
are areas near the edge of the sarcomere containing only thin filaments.
regions where thick and thin filaments overlap and correspond to the length of the thick filaments.
areas in the center of the A bands containing only thick filaments.
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