Anatomy - Maser
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| Muscle Fibers | muscle cells - elongated
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| Myofilaments | protein for muscle contraction; actin & myosin
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| Muscle root words | myo/mys/sarco
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| Skeletal Muscle | attach to skeleton = voluntary; stripes = striations
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| Striations | stripes
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| Cardiac Muscle | heart walls; striated & involuntary
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| Smooth Muscle | walls of hollow visceral organs; no striations & involuntary
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| Muscle Functions | produce movement, maintain posture, stabilize poorly reinforced joints, generate heat
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| Excitability | Irritability
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| Neurotransmitter | chemical stimulation
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| Acetylcholine (ACh) | neurotransmitter for skeletal muscle
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| Contractility | shorten when stimulated
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| Extensibility | will stretch or extend
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| Elasticity | will return to resting length after stretching
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| Endomysium | surrounds each muscle fiber
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| Perimysium | surrounds each fascicle bundle
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| Epimysium | surrounds entire muscle organ
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| Arteries deliver | O2 & nutrients
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| Veins remove | metabolic waste
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| Sarcolemma | plasma membrane of muscle
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| Sarcoplasm | cytoplasm
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| Myoglobin | red pigment protein stores O2
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| Myofibrils | contractile elements, run parallel entire length of fiber
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| Sarcomere | small contracting units from Z line to Z line
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| A bands | dark bands
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| H zone | lighter area in middle of A band, thin and thick filaments don't overlap
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| M line | dark line bisecting H zone, hold together adjacent thick filaments
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| I bands | light bands
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| Z line | dark midline thru I band
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| Myofilaments | make up myofibril
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| Myosin Protein | thick filament; tails bundled with 2 globular heads
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| Actin Protein | thin filaments
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| Globular actin | G actin, one actin protein
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| Fibrous actin | F actin, strand of globular proteins
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| Tropomyosin | 2 long, rod-shaped proteins, stiffen F actin
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| Troponin | connects tropomyosin to G actin
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| Sarcoplasmic Reticulum | regulates intracellular levels of Ca ions, releases Ca when needed to stimulate contractions
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| Transverse T Tubules | penetrate cell's interior and pass to all myofibrils to conduct impulses
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