a discrete bundle of muscle cells
Connective tissue surrounding a fascicle
Connective tissue layer surrounding an individual muscle
The specific name of the cell membrane of a muscle fiber
specialized endoplasmic reticulum of muscle cells that stores Ca+
Sac like structures that surround both side of a T-Tubule serves as reserivors for calcium ions
an invagination of the sarcolemma that projects deep into the muscle cell's interior
a Three unit group of one t-tubule lying adjacent between two Terminal Cisternae
one of many contractile filaments that make up a striated muscle fiber
Contractile proteins that slide pass one another
dark bands of the muscle made of myosin
lights bands gets smaller when muscle contacts
discets the Light bands (I bands)
at the M-line that gets shorter as the muscle contracts like the I-band
specialized synaptic junction btw a motor neuron and a skeletal muscle fiber
graded and depolarized
The motor end-plate potential generated by the synaptic release of acetylcholine (ACh) is always
the amplituded of the end plate potential is always
when a motor neuron _______ ACh is released and the muscle fiber attached to it contracts
During muscle contraction, cytosolic Ca2+is high, allowing actin and myosin to interact. Ca2+ binding induces a conformational change in the thin filament and its regulatory proteins exposing the myosin-binding site on actin.
During muscle relaxation, cytosolic Ca2+is low and tropomyosin is covering the myosin-binding site on acting preventing cross-bridge formation. The binding site of Ca2+ is on troponin.
In skeletal muscle, an action potential traveling down a t-tubule will result in the opening of an intracellular ion channel followed by the conformational change of the thin filament.
protein anchored at Z-line and runs length of actin filament
anchors the actin molecule and is the largest known protein in humans