The Muscular System

• Muscular System - composed of muscle tissue.
• Muscle tissue - the most abundant tissue of the body and are most adaptable.
• Functions of the Muscular System:

  • Movement of the body
  • Maintenance of posture
  • Respiration
  • Production of body heat
  • Communication
  • Constriction of organs and blood vessels
  • Contraction of the heart
• The Three Major Types of Muscle Tissues:

  • Skeletal Muscle Tissue
  • Cardiac Muscle Tissue
  • Smooth Muscle Tissue
• Skeletal Muscle - attached to bone.
• Cardiac Muscle - muscles in our heart.
• Smooth Muscle - muscle inside our organs such as the intestine, internal organs, visceral muscle, walls or hollow organs, blood vessels, or glands.
• Skeletal Muscle - long, cylindrical.
• Cardiac Muscle - branched and cylindrical.
• Smooth Muscle - spindle-shaped and fusiform.
• Skeletal Muscle - have multiple nucleus and is located peripheral.
• Cardiac Muscle - has 1 nucleus and is located in the middle.
• Smooth Muscle - has 1 nucleus and is located in the middle.
• Cardiac Muscle - has a special feature of intercalated disks.
• Smooth Muscle - has a special feature of cell-to-cell attachments.
• Skeletal Muscle - striated, no autorhythmic, and voluntary.
• Cardiac Muscle - striated, autorhythmic, and involuntary.
• Smooth Muscle - unstriated, autorhythmic, and involuntary.
• Skeletal Muscle - moves the whole body.
• Cardiac Muscle - contract heart to propel blood through the body.
• Smooth Muscle - compress organs, ducts, tubes, and so on.
• Skeletal Muscle - Striated Voluntary
• Cardiac Muscle - Striated Involuntary
• Smooth Muscle - Unstriated Involuntary
• Skeletal Muscles' Functions:

  • Movement of the body
  • Maintenance of posture
  • Respiration
  • Production of body heat
  • Communication
• Cardiac Muscles' Function:

  • Contraction of the heart
• Smooth Muscles' Function:

  • Constriction of organs and blood vessels
• Characteristics of Skeletal Muscles:

  • Contractility
  • Excitability
  • Extensibility
  • Elasticity
• Contractility - the ability of the skeletal muscle to shorten with force.
• Excitability - the capacity of the skeletal muscle to respond to stimulus.
• Extensibility - means that skeletal muscles stretch.
• Elasticity - the ability of the skeletal muscles to recoil to their original resting length after they have been stretched.