Chapter 14: Microscopic Anatomy and Organization of Skeletal Muscle Flashcards


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1

Skeletal Muscle, Characteristics

Voluntary control Striated and multinucleated

2

Skeletal Muscle, Functions

Allows movement. Influences body shape. Ability to manipulate environment.

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Cardiac Muscle, Characteristics

Involantary control striated and uninucleated

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Cardiac Muscles, Functions

Pumps blood throughout the body

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Smooth Muscles, Characteristics

Involuntary (except diaphragm) not striated and uninucleated

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Smooth Muscles, Function

Found in hollow organs and causes peristalsis, BP, pupil size, and erects hair

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Muscle Fiber

Long cylindrical muscle cell

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Myofibrils

Makes up muscle fibers and gives striated appearance. The contractile ORGANELLE of skeletal muscle

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Myofilament, Light (I) band (Thin filament)

Actin

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Myofilament, Dark (A) band (Think filament)

Myosin

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H Zone

Portion of A band where thick and thin filaments do not overlap (ONLY thick filament)

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Z line/disc

Bisects I band (from 1 z disc to another z disc = 1 sarcomere)

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Transverse (T) Tubule

Indent of sarcolemma at junction of A and I bands

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Sarcomere

Contractile unit of muscle

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Sarcoplasmic Reticulum

Similar to smooth ER. Stores Ca ions amongst other functions.

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Sarcolemma

Covering of individual muscle fibers (plasma membrane)

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Sarcoplasm

Cytoplasm of the muscle fiber (cell)

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Sarcosome

Mitochondria of the muscle cell

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Terminal Cisternae

Dilated end sacks of the sarcoplasmic reticulum

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Endomysium

Thin areolar CT surrounding each cell

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Perimysium

Collagenic membrane sheathing bundle of fibers

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Epimysium

Dense overcoat of CT around entire muscle

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Fascicle

Bundle of muscle fibers (cells)

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Deep Fascia

CT that binds muscle into functional groups

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Tendon

Connects muscle to bone (strong and cordlike)

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Aponeuroses

Connects muscle to muscle or muscle to bone (flat and sheet-like)

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Insertion

Movable point of attachment

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Origin

Fixed (immovable) point of attachment

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Neuromuscular Junction (NMJ)

Found between nerve fibers and muscle cells. A single neuron can stimulate many muscle cells.

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Motor Unit

Composed of the muscle cell and stimulating neuron.

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Synaptic Cleft

Gap between the neuron and muscle fiber.