Title: Skeletal Muscles | Summary, Innervation, Contract & Facts
Headings: Skeletal Muscles
Skeletal Muscles
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Skeletal Muscles
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Introduction
Quick Navigation
Organization
Skeletal Muscle Fiber
Sarcolemma
T-tubules
Myofibrils
Thin filaments
Thick filaments
Z-Disk
Sarcomere
Titin filaments
Sarcoplasm
Sarcoplasmic Reticulum
Innervation
Motor End Plate
Process of Innervation
Excitation-Contraction Coupling
Contraction and Relaxation
ATPase activity of Myosin Head
Role of Troponin in Contraction
Phases of Contraction
Relaxation
Energy Sources
Phosphocreatine
Glycolysis
Oxidative Metabolism
Summary
References

Content: Sarcoplasmic Reticulum
It is the specialized endoplasmic reticulum present in the skeletal muscle fibers. it appears as a network of tubules that is present among the myofibrils in the sarcoplasm. They have dilated terminal sacs called the terminal cisternae. In between the two terminal cisternae lies the invagination of the sarcolemma, the t-tubule. The two-terminal cisternae along with at-tubule in between them form a structure called triad. The function of the sarcoplasmic reticulum is to store calcium ions. These ions are released for the contraction of muscle fiber once the nerve impulse reaches the sarcoplasmic reticulum. Innervation
The contraction of skeletal muscle takes place upon excitation by a nerve fiber. A bundle of axons innervating several muscle fibers together form a neuromuscular junction. Each skeletal muscle is innervated by an axon that lies outside its sarcolemma forming a structure called the motor end plate.