The Muscular System

By: Siri Ketha and Riley Banks

The Basics

  • Three main muscle types
  • Visceral, Cardiac, and Skeletal
  • Diseases Muscular Dystrophy, Myasthenia Gravis, Myositis
  • main function is movement
  • muscles only tissue in body that can contract- move parts of body
  • muscles maintain posture and the body's position
  • moment of substances in body- mainly cardiac and visceral muscles
  • muscle tissue generates body heat
  • because of 'high metabolic rate of contracting muscle,' the system makes a lot of waste heat
  • small contractions in body make natural body heat


•diseases can be severe

•weakness to cramping paralysis

•Classified as primary diseases and non-primary diseases

•muscles are very interconnected with other parts of other systems


•inflammation and frequent infection of muscle tissue

•can be caused by many: bacteria, viruses, parasites

•most inflammatory muscle diseases are destructive

•can occur at any age

Muscular Dystrophy

•group of heredity diseases that cause 'progressive weaknesses and degeneration of skeletal muscles'

•usual early evidence of degeneration and regeneration of muscle fibres

•regenerated fibres become abnormally long

Myasthenia Gravis

•chronic autoimmune disease- muscle weakness and chronic fatigue

•primarily affects muscles on face, neck, throat, limbs

•symptoms are gradual

•muscle use worsens symptoms but helps restore strength