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140357
Muscle Cells
Descrição
Biology Muscle Mapa Mental sobre Muscle Cells, criado por dancedrill em 27-06-2013.
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biology muscle
biology muscle
Mapa Mental por
dancedrill
, atualizado more than 1 year ago
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Criado por
dancedrill
mais de 11 anos atrás
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Resumo de Recurso
Muscle Cells
Characteristics of muscles
responsiveness/excitability
Conductivity
Contractility
Extensibility
elasticity
returns to original resting length after being stretched.
can be stretched between contractions
shortens when stimulated
local electrical change triggers a wave of excitation, travels along muscle fiber.
responds to chemical signals, stretch and electrical changes across plasma membrane
Connective Tissue Elements
Tendons
Endomysium
Perimysium
epimysium
con tissue surrounds entire muscle.
continuous with collagen fibers of tendon
connec tissue around muscle fascicles
connec tissue AROUND muscle cells
tendons are attachments between muscle and bone matrix
The Muscle Fiber
Sarcolemma
Sarcoplasm
Myofibrils
Multiple nuclei
mitochondria
SR sarcoplasmic reticulum
tubules
triad
a T tubule and two terminal cisterns
tubular infoldings of sarcolemma penetrates through the cell and exists other side
release of Ca2+ into cell
smooth ER forms network around each myofibril
calcium reservoir needed to contract
packed in between myofibrils to produce ATP
flat nuclei pressed against inside of sarcolemma
long protein bundles occupies the main portion of sarcoplam
Glycogen
stored in abudance, long chain of glucsoe, provides energy with heightened exercise.
myoglobin
red pigment, stores oxygen to produce ATP
cytoplasm of m. fiber
plasma membrane of m. fiber.
Myofiliments
each myofibril is a bundle of parallel protein microfilaments called myofilaments
3 kinds of Myofilaments
Thick filament= Myosin
hundreds of myosin molecules
shaped like a golf club 2 chains intertwined forms a shaft like tail, double globular head
myosin heads are cross bridges attaches to actin and pulls it with regular movement.
Thin filament= Actin
Fibrous (F) actin; two intertwined strands. string of globular (G) actin submunits
string of globular (G) actin subunits each with an active site, binds to head of myosin molecule.
like a double strand of pearls.
Tropomyosin molecules each blocking 6-7 active sites on G actin subunits
Troponin molecule- small, calcium-binding protein , a calcium receptor on each tropomyosin molecule
needs calcium or it wont bind.
Elastic Myofilaments
Titin
made of protien (connectin)
Huge springy protein
helps stabilize thick filament=myosin
prevents over stretchin
contractile proteins
myosin and actin are called contractile proteins they shorten the muscle fiber.
Regulatory Proteins
troponin and topomyosin act like a switch to determine when fiber can contract and when it can't
contraction activated by rels of calcium into sarcoplasm and its binding to troponin
troponin changes shape and move topomyosin off the active sites on actin
Striations
myosin and actin are proteins that occur in all cells
function in cellular motility, mitosis, transport of intracellular material
organized in a precise way in skeletal and cardiac muscles.
A band= anisotropic. protein is myosin
part of A band where thick and thin filaments overlap
H band in the middle of A band, these are thick filaments
M line is in the middle of the H band
I band= isotropic. protein is actin.
alternating lighter band the way the bands reflect polarized light
Z Disc
provides anchorage for thin filaments and elastic filaments
Sarcomere
the segment of the myofibril one z disc to the next is one sarcomere
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