1.04 remember the_structures_of_the_muscular_system

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Health Science I Unit 1.04 Muscular System

Transcript of 1.04 remember the_structures_of_the_muscular_system

1.04 Remember 1.04 Remember the structures the structures

of the of the muscular systemmuscular system

1.04 Remember the structures of the muscular system

Essential QuestionEssential Question

• What are the structures of the muscular system?

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1.04 Remember the structures of the muscular system

The Muscular SystemThe Muscular System

• Comprises nearly half our weight.• Over 650 muscles.• Each muscle is made up of hundreds or

thousands of muscle fibers.

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1.04 Remember the structures of the muscular system

The Muscular SystemThe Muscular System::Muscle FibersMuscle Fibers

• Bundles of threadlike structures called myofibrils– Composed of:

• Myosin• Actin

– Form overlapping pattern called sarcomere

muscle muscle fiber

sarcolemma sarcomere

functional unit of muscle movement

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1.04 Remember the structures of the muscular system

Structures of the muscular systemStructures of the muscular system

MusclesMuscles

Skeletal

Smooth

Cardiac

Sphincter

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Connective tissueConnective tissue

Tendons

Fascia

1.04 Remember the structures of the muscular system

Structures of the muscular systemStructures of the muscular system

Types of muscleTypes of muscle

Skeletal

Smooth

Cardiac

Sphincter

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1.04 Remember the structures of the muscular system

Structures of the muscular systemStructures of the muscular system

Types of MuscleTypes of Muscle

Skeletal musclesSkeletal muscles

Attached to boneAttached to bone

Striated (striped) appearanceStriated (striped) appearance

VoluntaryVoluntary

Multinucleated (many nuclei) muscle Multinucleated (many nuclei) muscle

cell bundlescell bundles

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1.04 Remember the structures of the muscular system

Structures of the muscular systemStructures of the muscular system

Smooth muscles Smooth muscles ((visceral muscles)

Only one nucleus located in the center

of the cell

Involuntary movement

Located in walls of internal organs

such as stomach, intestines, uterus &

blood vessels

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1.04 Remember the structures of the muscular system

Structures of the muscular systemStructures of the muscular system

Cardiac MuscleCardiac Muscle Found only in the heart Striated, branched Involuntary movement Cells are fused- when one

contracts, they all contract, creating the heartbeat

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1.04 Remember the structures of the muscular system

Structures of the muscular systemStructures of the muscular system

Sphincter musclesSphincter musclesAlso called dilator musclesAlso called dilator musclesSpecial, circular musclesSpecial, circular musclesLocatedLocated

Between esophagus and stomachBetween esophagus and stomach Between stomach and small intestinesBetween stomach and small intestines Walls of the anusWalls of the anus Between the urinary bladder and the urethraBetween the urinary bladder and the urethra

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1.04 Remember the structures of the muscular system

Structures of the muscular systemStructures of the muscular system

Types of MuscleTypes of Muscle

Skeletal

Smooth

Cardiac

Sphincter

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1.04 Remember the structures of the muscular system

Structures of the muscular systemStructures of the muscular system

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Types of Connective tissueTypes of Connective tissue

Tendons

Fascia

1.04 Remember the structures of the muscular system

Structures of the muscular systemStructures of the muscular system

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Connective tissueConnective tissue

Tendons

dense bands that connect skeletal muscle

to the bone

1.04 Remember the structures of the muscular system

Structures of the muscular systemStructures of the muscular system

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Connective tissueConnective tissue

FasciaFascia

Fibrous connective tissue sheets that wrap around muscle bundles

1.04 Remember the structures of the muscular system

How do skeletal muscles get How do skeletal muscles get their names?their names?

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• However, However, • not all muscles are named by the above methods!not all muscles are named by the above methods!

1.04 Remember the structures of the muscular system

Head & Neck MusclesHead & Neck Muscles

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1.04 Remember the structures of the muscular system

Torso/TrunkTorso/Trunk(anterior)

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1.04 Remember the structures of the muscular system

Torso/TrunkTorso/Trunk(anterior)

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1.04 Remember the structures of the muscular system

Torso/TrunkTorso/Trunk(posterior)

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1.04 Remember the structures of the muscular system

Upper extremitiesUpper extremities

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1.04 Remember the structures of the muscular system

Lower extremitiesLower extremities

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1.04 Remember the structures of the muscular system

The muscular system reviewThe muscular system reviewAnterior viewAnterior view

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1.04 Remember the structures of the muscular system

The muscular system reviewThe muscular system reviewPosterior viewPosterior view

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1.04 Remember the structures of the muscular system

1.04 Remember the structures of the 1.04 Remember the structures of the

muscular systemmuscular system

Essential QuestionEssential Question• What are the structures of the muscular

system?

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