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21 Cards in this Set
- Front
- Back
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The muscle fibers in skeletal muscles are composed of smaller structures called ___.
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myofibrils
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Myofibrils are composed of ____.
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filaments
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The thick filaments contain a protein called _______.
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myosin
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The think filaments are made up mainly of a protein called ___.
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actin
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Myosin and actin line up in units called __________.
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sarcomeres
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Sarcomeres are separated from each other by regions called _____ _____.
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Z lines
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The tiny myosin and actin filaments are the ______- ____ engines that cause a muscle to contract.
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force-producing
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What occurs when a muscle contracts?
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The thin filaments slide over the thick filaments.
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What is the process of the thin filaments sliding over the thick filaments called?
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sliding-filament model
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Impluses from __ ___ control the contraction of skeletal muscle fibers.
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motor neurons
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The point of contact between a motor neuron and a skeletal muscle cell is called a __ ___.
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neuromuscular junction
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_____ is a neurotransmitter released by the motor neuron, which produces an impulse in the muscle.
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Acetylcholine
ace-tyl-choline |
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The _______ ions released by acetylcholine regulate proteins that allo muscle contraction.
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calcium ions
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When does the muscle stop contracting?
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When the acetylcholine stops releasing the calcium ions.
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Individual muscles can only pull in _______direction.
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one
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Skeletal muscles are joined to bones by tough connetive tissues called ______.
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tendons
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Most skeletal muscles work in _______ pairs.
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opposing
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What is an example of opposing pairs of skeletal muscles?
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When the arm bicep contracts, the tricep relaxes.
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Skeletal muscles generally remain in a state of partial contraction called ___ __ __.
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resting muscle tone
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What is resting muscle tone responsible for?
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Keeping your back and legs straight; and you head upright.
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_______ ____ is important in maintaining muscular strength and flexibility.
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Regular exercise
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