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15 Cards in this Set

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Internal organs utilize smooth muscle to perform their function, such as breathing and digestion.
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.
Summarize the sliding filament theory of muscle contraction.
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).
How can exercise change muscle strength? How can it change muscle function?
Exercise stresses muscles and causes fibers to increase in size and strength. Exercise cannot change muscle function
What determines muscle strength?
Muscle strength depends on the thickness of the muscle fibers and how many of the fibers contract at one time
Why would a disease that causes paralysis of smooth muscles be life threatening?
Internal organs utilize smooth muscle to perform their function, such as breathing and digestion. Without them, you'd probably die.
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.
smooth muscle
muscle in which contractions are not under conscious control (you cant control it)
involuntary muscle
type of involuntary muscle found only in the heart; composed of interconnected muscle fibers; adapted to generate and conduct electrical impulses for muscle contraction.
cardiac muscle
a type of voluntary muscle that is attached to and moves the bones of the skeleton.
skeletal muscle
muscle that contracts under conscious control (you can control it)
voluntary muscle
unit of muscle fibers composed of thick myosin protein filaments and thin actin protein filaments.
myofibril
structural protein that makes up the thick filaments of myofibrils; functions in muscle contraction.
myosin
structural protein in muscle cells that makes up the thin filaments of myofibrils; functions in muscle contraction.
actin
each section of a myofibril in muscle
sarcomere
theory that actin filaments slide toward each other during muscle contraction while the myosin filaments do not move.
sliding filament theory