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tasha
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portion of the myofibril
sarcomere
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runs from z line to z line
sarcomere
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dark band that has thick filaments and thin filaments
A band
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portion of A band that contain only thick filament
H zone
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during muscle contraction what happens to the h zone
disappear because the thin filaments invade the h zone
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central portion of a thick filament which is connected by proteins
m line
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contains z line and thin filaments
I band
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zig-zag shaped line is a membrand where the thin filaments are attached
Z line
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these are long proteins made either of action or myosin
myofilaments
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possess heads which are crucial for muscle contraction
thick filaments
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covers active site on actin and prevents actin and myosin heads from interacting.
tropomyosin (protein)
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tropomyosin is connected to
troponin
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for muscle contraction to occur:
troponin-tropomyosin must change and expose active sites on actin.
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What binds troponin and allows change in shape so that myosin heads can attach to the thin filaments.
calcium
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these heads are made of proteins which attach to a particular portion of the thin filaments during muscle contraction
myosin head
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When the myosin heads attach to the thin filaments they are then called
cross bridge
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anchored to the z line
thin filaments
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what is the role of the myosin heads
attach to the thin filaments, pull them, release & repeat.
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organelle is wrapped around the myofibril like a lacey sleeve
sarcoplasmic reticulum
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for muscle contraction to begin
calcium ions are released from the SR into the sacroplasm.
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What reabsorbs calium ions after muscle contraction to help the muscle relax
Sacroplasmic reticulum
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plasma membrane of the muscle cell
sarcolemma
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long filamentous organelle found in muscle cells; band appearance
myofibril
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in order for the entire muscle cell to contract at the same time-
transverse (T) extend into the cell at right angles to the cell's surface
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at the end of each muscle, the collagen fibers of the endomysium and perimysium come together to for either a ______ or________
tendon or aponeuroses
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both connect skeletal muscles to bone
tendon and aponeroses
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connect muscle to muscle
aponeuroses
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this layer is connected to the fascia
epimysium
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contains collagen and elastic fibers, nerves and blood vessels
perimysium
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(cytoplasm) of the muscle cell
sacroplasm
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muscle's ability to react to a stimulus
excitability
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muscle shortens upon stimulation
contractility
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muscle returns to normal length after stretching.
elasticity
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