Functional Characteristics of
Muscle Tissue
• Electrical excitability
– Autorythmic
– Chemical Stimuli
• Contractility
– Ability to shorten forcibly when adequately stimulated
• Extensibility
– Smooth muscle subjected the most
• Elasticity
– Ability of a muscle fiber to recoil and resume its
resting length after stretching
Functions of Muscle
• Producing body movement
• Movement of substances within the body
• Stabilizing body positions
– Joints
– Postural muscles
• Produce heat
– Maintain normal body heat
– Shivering
Attachment
Nerve and Blood Supply
Skeletal Muscle
Anatomy of Muscle Fiber
What makes the striations?
• Striations
– A band
• H zone
– M line
– I band
• Z line
• Sarcomere
Composition of Myofilaments
Hierarchy of structure
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Muscle
Fascicle
Muscle Fiber (Cell)
Myofibril
Myofilament
Sarcoplasmic Reticulum &
T Tubules
Contraction: The
Sliding Filament
Model
Sliding Filament Theory
Calcium and the Regulatory
Proteins
Excitation-Contraction Coupling