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Chpt 2: K
Pig Disection: Muscles
14
Biology
12th Grade
01/18/2013

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Term
Myofibrils
Definition
Contractile elements of the muscle; contains dark and light bands
Term
A Band
Definition
Dark bands of the myofibrils
Term
I Band
Definition
Light bands of the myofibrils
Term
Sarcomeres
Definition
Contractile unit of the myofibril
Term
Motor Unit
Definition
All muscle fibers innervated by a single nerve fiber
Term
Actin filaments
Definition
Thinner filament of the I band of the sarcomere.
Term
Myosin filaments
Definition
Thinner filament of the A band of the sarcomere.
Term
Striated Muscle
Definition
Another name for the skeletal muscle
Term
Sarcolemma
Definition
Inner surface of the cell membrane of the skeletal muscle
Term
Muscle Fibers
Definition
Another name for the muscle cells that make up the skeletal muscles; they range in length from a few cm to as long as the muscles the form.
Term
Smooth Muscle
Definition
Type of muscles found in the walls of the most visceral organs and blood vessels.
Term
Intercalated Disks
Definition
Junctions of cardiac muscle where muscle cells are joined to other muscle cells
Term
Cardiac Muscle
Definition
Muscle of the heart wall.
Term
Z line
Definition
Divides I bamd and serves as an anchoring place for the actin filaments to two adjacent sarcomeres.
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