muscular system

• three types of muscle tissue: skeletal, cardiac, smooth
• skeletal - long, cylindrical in shape, and are multinucleated

  • striated
  • voluntary
  • they generate heat when muscle conract
• cardiac - striated, branched, and interconnected by intercalated discs

  • usually mononucleated
  • involuntary
  • in the walls of heart
• smooth - non-striated, one nucleus

  • involuntary
  • controls contraction of organs
  • moves substances through the body's internal passageways
• how do they work?

  • excitation
  • action
  • movement
  • relaxation