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35 Cards in this Set
- Front
- Back
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Function: voluntary movement of the skeletal system.
Location: muscles usually attached to bones. |
skeletal muscle
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Function: involuntary movements of internal organs.
Location: walls of internal organs. |
smooth muscle
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Function: movement of the heart.
Location: the heart muscle. |
cardiac muscle
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Sheets of fibrous connective tissue that encloses a muscle; is often continuous with a tendon.
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fascia
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Bone--muscle--tendon--bone.
Tendon is a "plastic" cord-like structure that transfers the pull of a muscle to the bone with little loss of energy. |
musculotendon unit
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Outer sheath of connective tissue surrounding a SKELETAL MUSCLE.
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epimysium
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Sheath of connective tissue that encloses a BUNDLE of skeletal FIBERS.
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perimysium
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Sheath of connective tissue that surrounds EACH skeletal muscle FIBER.
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endomysium
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A group of muscle fibers.
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fascicles
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Very long single cells that contract when stimulated.
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muscle fiber
(muscle cell, same thing) |
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The cell membrane of muscle cells.
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sarcolemma
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The cytoplasm of muscle cells.
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sarcoplasm
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Fundamental contractile units made up of two protein filaments (actin and myosin).
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myofibrils
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Two proteins ACTIN and MYOSIN that create a muscular contraction by sliding past one another.
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filaments
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Filaments physically slide past each other creating a...
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contraction
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The "Thin Filament" is anchored at the ends.
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actin
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The "Thick Filament" lies between 6 actin strnds and has long heads (cros-bridge) that can attach to "active sites" on actin.
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myosin
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Active sites are covered by a protein called...
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tropomyosin
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Tropomyosin is attached to another protein called...
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troponin
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The long heads of the myosin filaments can swival back and forth pulling opposing actin...
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toward each other.
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The basic contractile unit of muscle.
Fron z-line to z-line. |
sarcomere
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Calcium is highly attracted to...
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troponin.
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Troponin is pulled over by...
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calcium.
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Troponin, while chasing calcium, pulls tropomyosin strand over revealing...
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actin.
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Myosin filament attaches to revealed...
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actin.
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Action potential travels down an...
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alpha motor neuron to a motor end plate.
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Released from presynaptic vesicles. Diffuses across the synaptic cleft and depolarizes the sarcolema (muscle membrane).
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ACH
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Wave of depoloarization (excitation)...
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spreads across the sarcolema and down t-tubules.
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Connect with the sarcoplasmic reticulum and the wave of excitation causes calcium to be released.
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t-tubules
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Calcium (Ca++) bind with...
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troponin
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Moves tropomyosin out of the way of the actin sites.
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troponin
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Myosin head with ATP attached...
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cleaves the ATP into ADP+Pi
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Pi is released from the Myosin head and the head changes shape and...
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pivots to pull actin and myosin past each other.
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ADP is then discarded and a new ATP...
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binds with Myosin causing it to release from Actin.
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Ca++ is resequestered by the sarcoplasmic reticulum and is...
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ready for the next wave of depolarization.
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