Eric Walker added a number of links to Pulse oximeters, and added Pulse oximeters to a number of topics

Eric Walker added Blood, Cardiovascular disorders and diseases and Heart to Circulatory system, and added Circulatory system to Physiology

Eric Walker added a number of topics and a number of links to Heart disorders, injuries and diseases, and added Heart disorders, injuries and diseases to Cardiovascular disorders and diseases and Heart

Eric Walker added Heart disorders, injuries and diseases and Pulse oximeters to Heart, and added Heart to Circulatory system