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Flashcards in Muscular System Deck (133)
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1
Muscular System

myology

scientific study of muscles

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Muscular System

skeletal muscle

attached primarily to bone, striated and voluntary

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Muscular System

cardiac muscle

most of the heart, striated and involuntary

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Muscular System

smooth muscle

walls of hollow internal organs, blood vessels, stomach, non-striated, involuntary

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Muscular System

functions of muscle tissue

1. produce body movements 2. stabilize body positions 3. store and move substances within the body 4. generate heat

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Muscular System

tendon

""pick up sticks"" (panty hose) fascia, stretched beyond muscle as connective tissue attaches muscle to bone

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Muscular System

muscle fascicle

groups of 10 to 100 or more muscle fibers, arranged in bundles

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Muscular System

muscle fiber (cell)

1 ""pick up stick"" each muscle is a separate organ composed of hundreds of long, cylindrical cells, lie parallel to one another. contains myofibrils

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Muscular System

myofibrils

""piece"" threads in sarcoplasm, extends lengthwise. contain the myofilaments

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Muscular System

myofilaments

what thick and thin filaments are called, contractile proteins

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Muscular System

thick filament- myosin

2 golf clubs twisted together, produce power stroke

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Muscular System

thin filament- actin

twisted helix, binding site for myosin

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Muscular System

thin filament- tropomyosin

covers the myosin head-binding site on actin in relaxed muscle

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Muscular System

thin filament- troponin

once bound to calcium, drags tropomyosin away from the binding sites

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Muscular System

sarcomere

describes the arrangement of the above myofilaments. compartments where think and thick filaments are arranged. basic functional unit of the muscle cell

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Muscular System

sarcoplasm

muscle fiber cytoplasm

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Muscular System

the sliding filament mechanism

describes a muscle contraction. the length of the filaments do not change, filaments overlap, shortening the sarcomere as the muscle contracts.

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Muscular System

sarcoplasmic reticulum

a fluid filled cavity around each myofibril that stores calcium via the calcium pump

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Muscular System

calcium

in relaxed muscle, calcium is stored in the sarcoplasmic reticulum. when released starts the filaments sliding (contracts)

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Muscular System

what must happen for a muscle to contract?

motor neuron, action potential, acetylcholin is released, release of calcium, calcium released from sarcoplasmic reticulum, calcium binds to troponin

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Muscular System

ATP

energy source that makes all this happen

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Muscular System

how does muscle fiber relax?

action potential stops, acetylcholine stops, calcium chambers close, calcium pump removes the remaining calcium, myosin heads no longer can bind, muscle will now relax

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Muscular System

origin of muscle

attachment to tendon to stationary bone

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Muscular System

insertion of muscle

attachment of other tendon to movable bone

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Muscular System

belly of muscle

fleshy portion of muscle between the tendons

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Muscular System

muscles of facial expression

originate in the bones of skull and insert into the skin

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Muscular System

frontal belly

scalp anteriorly

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Muscular System

occipital belly

scalp posteriorly

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Muscular System

orbicularis oris

closes and protrudes the lips. shapes the lips during speech

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Muscular System

zygomaticus (major and minor)

muscles for smiling