fibers
prime mover of any skeletal movement
agonisitic muscle
specialized region of sacrolemma at neuromuscular junctions (acetylcholine receptors)
Motor end plate
protein actin (I band light under scope)
thin filaments
extensions of myosin with "arms" and "heads"
cross bridges
thin filament
F actin
produce opposite action to agonists
antagonisitic muscle
motor neuron and all innervated muscle fibers (1:100-1:2000)
motor unit
light areas between stacks of thick filaments (myosin) (anchored by M lines)
I bands
ATP binding site & actin binding site on "head"
Myosin AtPase
inhibits myosin binding
troponin I
plasma membrane of muscle fibers
sacrolemma
subunits of muscle fibers (1um)
myofibrils
stacks of thick filaments with overlapping thin (actin)
A bands
force that pulls thin filament towards A band
power stroke
binds to tropomyosin
troponin T
cytoplasm of muscle fibers
sacroplasm
even smaller structures within myofibrils
myofilaments
sections of A bands without overlap
H bands
subunits of f-actin
G-actin
binds Ca2+
Troponin C
E.R of muscle fibers ( stores Ca2+)
sacroplasmic reticulum
protein myosin- A band (dark under scope)
thick filaments
hexagonal structures that connect sacromeres (myosin attaches via titin-recoil)
Z discs
(inside helix) binds troponin complexes
Tropomyosin
active transport of Ca2+ out to cytoplasmic reticul (terminal cisternae) (modified ERs that surround each myofibril)
Muscle relaxation