Skeletal Muscle
Types of Muscle
Skeletal Muscle Function
Organization
Ultrastructure
Fibers
Sarcomere Organization
Regulation
E-C Coupling
E-C Coupling
Electrical and Mechanical
Muscle Fiber Types
palereddark red (myoglobin)Color
Glycolytic, more anaerobic than fast-twitch
Glycolytic, more oxidative withtraining
Oxidative, aerobic, numerousmitochondriaMetabolism
Easily FatiguedFatigue ResistantFatigue ResistantEndurance
HighHighModerateCa-ATPase
ShortShortLongestContraction Duration
LargeMediumSmallDiameter
FastFastSlowMyosin ATPase
activity
FastestIntermediateSlowestTime of tension
Fast Twitch Glycolytic; White MuscleFast-Twitch Oxidative; Red MuscleSlow Twitch Oxidative; Red Muscle
Tetanus?
Knee Jerk Reflex
• Figure 13.7• Stimulus is the hammer on the patellar
tendon• Afferent Path CNS Efferent Path Muscle Contraction and forced relaxation
Summation