Healthcare and medicine

Heart Muscle Contraction

  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
  5. Calcium Puts Myosin to Work
  6. Sympathetic Nerves Affect Myosin Activity
  7. Why Doesn't the Heart Rip?

Why Doesn't the Heart Rip? Understand LaPlace's law to see the effect that pressure, radius, and wall thickness each have on the "wall stress" in the left ventricle. Rishi is a pediatric infectious disease physician and works at Khan Academy.

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Why Doesn't the Heart Rip?

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