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15 Cards in this Set
- Front
- Back
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Internal organs utilize smooth muscle to perform their function, such as breathing and digestion.
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Smooth muscle cells are spindle shaped and form the linings of organs. They apply pressure and squeeze and are involuntary. Cardiac muscle cells are striated and form a contraction network in the heart (involuntary). Skeletal muscle cells are striated. They move the body and are voluntary.
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Summarize the sliding filament theory of muscle contraction.
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Calcium is released into the muscle fiber, actin and myosin filaments form attachments, and the actin filaments are pulled inward toward the center of each sarcomere (=contraction).
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How can exercise change muscle strength? How can it change muscle function?
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Exercise stresses muscles and causes fibers to increase in size and strength. Exercise cannot change muscle function
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What determines muscle strength?
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Muscle strength depends on the thickness of the muscle fibers and how many of the fibers contract at one time
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Why would a disease that causes paralysis of smooth muscles be life threatening?
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Internal organs utilize smooth muscle to perform their function, such as breathing and digestion. Without them, you'd probably die.
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type of involuntary muscle found in the walls of internal organs and blood vessels; most common function is to squeeze, exerting pressure inside the tube or organ it surrounds.
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smooth muscle
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muscle in which contractions are not under conscious control (you cant control it)
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involuntary muscle
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type of involuntary muscle found only in the heart; composed of interconnected muscle fibers; adapted to generate and conduct electrical impulses for muscle contraction.
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cardiac muscle
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a type of voluntary muscle that is attached to and moves the bones of the skeleton.
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skeletal muscle
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muscle that contracts under conscious control (you can control it)
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voluntary muscle
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unit of muscle fibers composed of thick myosin protein filaments and thin actin protein filaments.
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myofibril
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structural protein that makes up the thick filaments of myofibrils; functions in muscle contraction.
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myosin
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structural protein in muscle cells that makes up the thin filaments of myofibrils; functions in muscle contraction.
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actin
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each section of a myofibril in muscle
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sarcomere
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theory that actin filaments slide toward each other during muscle contraction while the myosin filaments do not move.
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sliding filament theory
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