THE MUSCULAR THE MUSCULAR SYSTEMSYSTEM

CHAPTER 10CHAPTER 10

Interactions of Interactions of Skeletal MuscleSkeletal Muscle

Agonist=prime moverAgonist=prime mover

Antagonist=opposes the agonistAntagonist=opposes the agonist

Synergist=helpersSynergist=helpers

Fixators=immobilizersFixators=immobilizers

Naming Skeletal MusclesNaming Skeletal Muscles

LocationLocation ShapeShape Relative sizeRelative size DirectionDirection Number of originsNumber of origins Location of attachmentsLocation of attachments ActionAction

Fascicle ArrangementFascicle Arrangement

Muscle MechanicsMuscle Mechanics

Lever SystemsLever Systems

What is a Lever?What is a Lever?

A A leverlever is a rigid bar that moves on a is a rigid bar that moves on a fixed point, or fixed point, or fulcrumfulcrum, when a force , when a force is applied to it. The applied force, or is applied to it. The applied force, or efforteffort, is used to move a resistance, , is used to move a resistance, or or loadload. .

Mechanical AdvantageMechanical Advantage

Mechanical DisadvantageMechanical Disadvantage

Three Classes of LeversThree Classes of Levers

Three Classes of LeversThree Classes of Levers

Three Classes of LeversThree Classes of Levers

Human Muscular SystemHuman Muscular System

Homeostatic ImbalancesHomeostatic Imbalances

Myasthenia gravisMyasthenia gravis Rigor mortisRigor mortis AtrophyAtrophy Duchenne muscular dystrophyDuchenne muscular dystrophy HerniaHernia MyalgiaMyalgia FibromyositisFibromyositis StrainStrain