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10 Cards in this Set
- Front
- Back
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Muscles convert chemical energy into _____
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mechanical energy
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Muscles account for about _____ of the body's weight
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one third
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The ability for muscles to contract does what?
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(1) enables the body to move and (2)pushes substances (food and blood) throughout the body
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Skeletal Muscle Cells are...
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(1) Striated with multiple nuclei. (2) arranged as many, long, cylindrical cells bundled together (3) with several bundles enclosed in tough connective tissue sheath (4) responsible for voluntary movement, and (5) connected to bones via tendons.
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Smooth Muscle Cells are...
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(1) not striated, with a single nucleus. (2) cells are tapered at both ends, and are held together by tight junctions (3) are located in the walls of hollow organs like blood vessels (4) are responsible for involuntary movements, like peristalsis (5) not connected by tendons.
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Cardiac Muscles Cells are...
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(1) striated with multiple nuclei. (2) the cells are branched and connected end-to-end by junctions that allow electrical current flow (3) located only in heart wall
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A muscle fiber is a...
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single, multinucleated muscle cell.
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Muscles are made up of...
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hundreds or thousands of muscle fibers, depending on its size. A large amount of connective tissue, blood vessels, and nerves are also present.
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Muscle fibers consist of bundles of threadlike structures called _____.
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myofibrils.
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Each myofbril is made up of two types of proteins filaments; thick ones and thin ones. The thick filaments are made up of a protein called _____. The thin filaments are amde of a protein called _____.
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Myosin, Actin
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