Flashcards
Muscle Tissue (General features & classification)
Cards in this deck (11)
- 1***why muscle cell is unique? (basics contractile structure)*Muscle cells are called; Muscle Fibers.
= highly differentiated w/ Actin & Myosin Filaments for Contraction
[via sliding filament theory...] - 2***3 key features of Muscle Tissue- No propper Intracellular Matrix; contains Loose Conective tissue instead.
- Have many vessels and nerves.
- there are 3 types of microscopic organization. - 3***Classifying muscles:classifying BY INNERVATION-
-Voluntary = Skeletal Muscle.
-Involuntary = SM & CM.
classifying BY STRIATION-
-striated= Skeletal & Cardiac.
-Non = SM. - 4***Myofibril Histogenesis(origin MesoBlast/MesenChyme cells)
1)...Proliferate&Differentiate = Myoblast
2)Myoblasts fuse= multinucleate myotubes
3) myotubes ⇒ Myofibrils
~myoblasts that don't fuse= Satelite cells (are reserve stem cells) - 5< Smooth Muscle Ultrastructure >= Elongated & spindle-shaped,
Mononucleated, with nucleus @ center.
- contains sarcoplasm with 3 filaments Actin/ Myosin& Intermediate filaments.
- Dark bodies, join filaments together= stronger contraction. - 6~ Cardiac Muscle Ultrastructure ~=striated ∵ of myofibril arrangement.
Myofibrils are made up by sarcomeres.
H Band= thick
A Band = Dark (thick & thin)
I Band = Light (thin)... @middle is "Z Line"
-have (Transverse) T-Tubules to initiate contractions. - 7-- Skeletal Striated Muscle Ultrastructure ---Striated & can be Multi-Nucleated.
-have a "Basement Membrane" inc; Satelite cells for repair and growth .
membrane= Sarcolemma
Lysosome= Sarcosome
SR- Sarcoplasmic reticulum
cytoplasm = Sarcoplasm
Sarcomere = repeat unit for the MyoFibril
-have (Transverse) T-Tubules to initiate contractions.
-ATP=main source(+glycogen+lipid droplets) - 8<>=Cellular type of organization.
*SM-cells have 2 junctions:
- Zonula Adherens- adhesion between cells
- Nexus- allow electrical coupling.
*regulated by Autonomic-NS.
>Found in Vessels
>in gut and Bladder, contract to allow peristalsis & emptying the bladder. - 9~~Cardiac Muscle Structure & function~~=Syntical type of organization.
*3 types = contractile/ pace maker/ endocrine cardiac -cells.
*intercalated discs:
-join cells/ pass' impulses & contractions.
-are made of contacts: Nexus, Desmosomes & zonula adherens.
*regulated by Autonomic-NS.
-found @ heart - 10-- Skeletal Striated Muscle Structure & Function --=Symplast type of organization.
*muscle belly is joint to Bone, via Tendons.
-Sliding Filament theory... allows Powerfull contractions & relaxation ... to allow powerful movements. - 11SARCOMERE Structure
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- +Structure/ Ultrastructure& Characteristics of: "SM, CM, ssM"
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- fazan ahmed
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