MUSCULAR SYSTEM

The muscular system is a vital component of the human body, responsible for movement, posture, circulation, and the propulsion of substances within internal organs. Muscle tissue is uniquely specialized to convert chemical energy into mechanical force through coordinated cellular and molecular mechanisms. This chapter provides a detailed and structured account of the muscular system with expanded explanations under clear subheadings. It discusses the classification and physiology of muscle types, the molecular basis of muscle contraction, the structure and function of the neuromuscular junction, major categories of myopathies, and the pharmacological role of muscle relaxants. An integrated understanding of these topics is essential for interpreting normal motor function, neuromuscular disorders, and clinical pharmacology.