The Human Heart: References

How does blood flow through the heart. Cleveland Clinic. http://my.clevelandclinic.org/services/heart/heart-blood-vessels/how-does-blood-flow-through-heart. Accessed July 2016.

Heart anatomy. Texas heart Institute. http://www.texasheart.org/HIC/Anatomy/anatomy2.cfm. Updated July 2015. Accessed July 2016.

US Department of Health and Human Services. National Institutes of Health. National Heart, Lung, and Blood Institute. Your heart’s electrical system. https://www.nhlbi.nih.gov/health/health-topics/topics/hhw/electrical. Updated November 17, 2011. Accessed July 2016.