Why do you have two lungs but only one heart?

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What makes your heart beat?

What makes your heart beat?

What makes your heart beat? Learn more about what makes your heart beat from Discovery Health.


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  • Cachel, Susan Ph.D. Professor of Physical Anthropology, Rutgers University. Personal interview. December 11, 2007.
  • Garland, T. Jr. and Carter, P.A. "Evolutionary physiology." Annual Review of Physiology. 1994. http://www.biology.ucr.edu/people/faculty/Garland/GarlCa94.pdf
  • ­­Martin, Bruce Ph.D.­ ­Professor of Physiology. Indiana University, Bloomington. Personal interview. December 11, 2007.
  • Neff, Tony Ph.D. Professor of Anatomy and Cell Biology. Indiana University, Bloomington. Personal interview. December 11, 2007.