Healthcare and medicine
Heart Muscle Contraction
Find out more about heart muscles and what happens when they contract.
  1. Three Types of Muscle
  2. Heart Cells Up Close!
  3. Myosin and Actin
  4. Tropomyosin and troponin and their role in regulating muscle contraction
  1. Calcium Puts Myosin to Work
  2. Sympathetic Nerves Affect Myosin Activity
  3. Why Doesn't the Heart Rip?