بسم الله الرحمن الرحیم

Muscular system

Type of Muscles Skeletal Muscle Cardiac Muscle Smooth Muscle

Diameter of Skeletal Muscle Specific Muscle Age Sex State of Nutrition Physical Training HHypertrophy HHyperplasia

Organization of Skeletal Muscle

Skeletal Muscle

Organization of Skeletal Muscle

Organizati on of Skeletal Muscle Fiber

Cross Striation

Myofilaments Thin filament  Actin  Tropmyosin  Troponin Thick filament  Myosin

G Actin Thin Filament F Actin Troponin Tropomyosi n

Thin filament

Thick Filament Myosin

Actin & myosin Summary Slide

Myosin

Actin & myosin Summary Slide

Organization of the Myofilaments

Myofilaments

T Tubule Terminal Cisternae Sarcoplasmic Reticulum Triad Sarcolamma & Sarcoplasmic Reticulum

triad

Transmission of the signal to SER

Contraction Mechanism

Contraction mechanism

Myofilaments

Myotendineal Junction

Innervation

Myasthenia Gravis Autoimmune Disorder Prograssive mascular weakness Reduction of acetylcholin receptors

Type of skeletal muscle Type I: slow, red oxidative fibers  many mitochondria and myoglobin  Gain energy by aerobic oxidative phosphorilation  Prolong contraction  Back muscle

Type of skeletal muscle Type IIa:fast, intermediate oxidative-glycolytic fiber  many mitochondria and myoglobin  Considerable glycogen  Both oxidative and anaerobic glycolysis  Rapid contraction short burst of activity

Type of skeletal muscle Type IIb: fast, white glycolytic fibers  fewer mitochondria, less myoglobin and abundant glycogen  Depend on glycolysis  Adapt for rapid contraction

Skeletal muscle types

Myogenesis (Straited Muscle)

Muscle Spindle Intrafusal muscle fibers  Nuclear chain fibers  Nuclear bag fibers Extrafusal muscle fibers

Cardiac Muscle

Cardiac Muscle intercalated Disc

Cardiac Muscle

Diad & Intercalated disc In Cardiac Muscle cell

Smooth muscle

Smooth Muscle

Smooth muscle contraction

Smooth Muscle cell

Smooth Muscle

Contraction mechanism