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Chapter 6:,[object Object],Contraction of Skeletal Muscle,[object Object]
Anatomy of Skeletal Muscle,[object Object],Gross organization:,[object Object],Figure 6-1; Guyton & Hall,[object Object]
Cellular Organization,[object Object],Muscle fibers,[object Object],[object Object]
  multinucleated
  surrounded by thesarcolemma,[object Object],Myofibrils,[object Object],[object Object]
  surrounded by the sarcoplasm,[object Object],Cellular organelles -  lie between myofibrils (mitochondria, sarcoplasmic reticulum etc.),[object Object],Figure 6-1; Guyton & Hall,[object Object]
Molecular Organization,[object Object],Figure 6-1; Guyton & Hall,[object Object]
sarcomere,[object Object],A band,[object Object],H zone,[object Object],I band,[object Object],M line,[object Object],Z disc,[object Object],The Sarcomere,[object Object],thick filament (myosin),[object Object],thin filament (actin),[object Object],titin (filamentous structural protein),[object Object]
“Sliding Filament” Mechanism,[object Object],Contraction results from the sliding action of interdigitating actin and myosin filaments,[object Object],RELAXED:,[object Object],CONTRACTED:,[object Object]
The Actin Filament,[object Object],[object Object]
tethered at one end at    the Z disc,[object Object],[object Object],nebulin forms guide for ,[object Object],    synthesis,[object Object],Figure 6-6; Guyton & Hall,[object Object],tropomyosin,[object Object],[object Object]
  prevents interaction   with myosin,[object Object],F-actin,[object Object],[object Object]
 composed of polymerized G-actin
ADP bound to each G-actin (active sites),[object Object],[object Object],troponin,[object Object],[object Object]
T - binds tropomyosin
C - binds Ca2+,[object Object]
  four light chains (MW 20,000)
  “head” region - site of ATPase activityFigure 6-5; Guyton & Hall,[object Object]
Mechanism of Muscle Contraction,[object Object],Theory:,[object Object],Binding of Ca2+ to troponin results in a conformational change in tropomyosin that “uncovers” the active sites on the actin molecule, allowing for myosin to bind.,[object Object]
“Walk-Along” Theory,[object Object],Figure 6-7; Guyton & Hall,[object Object]
ADP,[object Object],ATP,[object Object],hydrolysis,[object Object],Pi,[object Object],“Walk-Along” Theory,[object Object],1.  Myosin head attached to actin,[object Object],POWER STROKE,[object Object],4.  Myosin head attaches to new site,[object Object],(ADP bound),[object Object],2.  Myosin head releases,[object Object],(ATP bound),[object Object],3.  Myosin head “cocked”,[object Object],(ADP and Pi bound),[object Object]
ATP,[object Object],1.  Myosin head attached to actin,[object Object],RIGOR,[object Object],Rigor mortis:,[object Object],[object Object]
  due to loss of ATP,[object Object]
Length-Tension Relation for Skeletal Muscle,[object Object],Normal operating,[object Object],          range,[object Object],Active tension cannot be measured directly,[object Object],What can be measured?,[object Object],(1) passive tension - tension required to extend a resting muscle,[object Object],(2)  total tension - active tension and passive combined,[object Object],Active is calculated from 1 & 2,[object Object],        (AT = TT – PT),[object Object],Note that active tension falls away linearly with increasing length,[object Object],100,[object Object],total tension,[object Object],50,[object Object],Tension (%age max contraction),[object Object],active tension,[object Object],passive tension,[object Object],1.0,[object Object],2.0,[object Object],0,[object Object],Length (proportion of resting length),[object Object]
100,[object Object],  50,[object Object],0,[object Object],Total tension,[object Object],         0                   1x                 2x ,[object Object],        Length (proportion of resting length),[object Object],Zero tension,[object Object],stimulus,[object Object],1,[object Object],2,[object Object],2,[object Object],3,[object Object],3,[object Object],1,[object Object],Passive tension,[object Object],Length-Tension Relation – The Experiment,[object Object],(preload),[object Object],total,[object Object],passive,[object Object],(afterload = ∞),[object Object],Tension(%age max contraction),[object Object],active,[object Object]
Normal operating ,[object Object],range,[object Object],1,[object Object],0.5,[object Object],0,[object Object],0,[object Object],1,[object Object],2,[object Object],3,[object Object],4,[object Object],sarcomere length (mm),[object Object],Tension as a Function of Sarcomere Length,[object Object],Stress is used to compare tension (force) generated by different sized muscles,[object Object],stress = force/cross-sectional area of muscle; units kg/cm2),[object Object],In skeletal muscle, maximal active  stress is developed at normal resting length ~ 2 mm,[object Object],At longer lengths, stress declines -,[object Object],At shorter lengths stress also declines -,[object Object],Cardiac muscle normally operates at lengths below optimal length -,[object Object],active,[object Object],stress,[object Object],(tension),[object Object]

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fisologia del musculo