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Glossary of Muscular System

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Created by kjul5

Muscles
Associated with movement, three types
Cardiac, Skeletal, Smooth
The three types of muscles
Skeletal
Voluntary, striated, elongated, attached to bones
Cardiac
Pumps blood, involuntary, striated, branching, heart
Smooth
Visceral, involuntary, nonstriated, spindle, walls of hollow internal surfaces
Rule # 1
Must have at least two attachments, and must cross at least one joint (except facial and pelvic)
Rule # 2
To produce movement, muscles always pull and get shorter
Rule # 3
Muscle fibers and striations ALWAYS point to attachments and show direction or pull
Muscle Cells
Also known as muscle fibers
Fasicle
Bundle of muscle fibers
Perimysium
Connective tissue that supports fasicles (around it)
Epimysium
Sheath of fibrous connective tissue surrounding a muscle (also known as fascis)
Origin
Attachment of the muscle that stays in its "original" position
Insertion
The attachment of the muscle that moves
Muscle Characteristics
Contractibility, Extensibility (flexibility), Elasticity, Excitability (irritation)
Contractibility
Able to shorten
Extensibility (flexibility)
Able to lengthen
Elasticity
Able to return to its original shape
Excitatibility (irritability)
Able to respond to a stimulus
Muscle Functions
Movement Facilitation, Thermogenesis, Postural Support, Regulation of organ volume, Protects internal organs, Pumps blood (heart
Actin
Thin Filaments, each molecule contains a binding site for Myosin
Tropomysosin and Troponin
Two proteins in thin filaments
Myosin
Thick myofilaments composed mostly of this, shaped like a golf club
Tendon
Connects muscles to bone
Myalgia
Muscle pain

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