Concept
Version 8
Created by Boundless
The Cardiac Cycle
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"OpenStax College, Mammalian Heart and Blood Vessels. October 17, 2013."
http://cnx.org/content/m44805/latest/Figure_40_03_04.jpg
OpenStax CNX
CC BY 3.0.