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Medical Terminology: A Living Language Chapter 4 Section II- Muscular System

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Function of Muscular System

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Function of Muscular System

Muscles are bundles, sheets, or rings of tissue that produce movement by contracting and pulling on the structures to which they are attached.

bundles of parallel muscle tissue fibers
produce movement, hold body erect, and generate heat

muscle tissue fibers

make up muscles

skeletal, smooth, and cardiac

three types of muscles

voluntary muscles

a person consciously chooses which muscles to contract and how long and hard to contract them
ex) skeletal muscles of arms and legs

involuntary muscles

under control of the subconscious regions of the brain
ex) smooth muscles in internal organs and cardiac muscles

skeletal muscle

directly or indirectly attached to bones and produce voluntary movement of the skeleton

striated muscle

another name for skeletal muscles
b/c of its striped appearance under a microscope

fibrous connective tissue that wraps each skeletal muscles in layers

when fascia tapers at each end of a skeletal muscle
very strong
inserts into the periosteum covering a bone to anchor the muscle to the bone

stimulate skeletal muscles

myoneural junction

point at which the motor nerve contacts a muscle fiber

found in walls of the hollow organs (stomach, tube shaped, airways, blood vessels)
lacks the striations of skeletal muscle

visceral muscle

another name for smooth muscles

makes up the wall of the heart
each involuntary contraction squeezes to pump blood