Regurgitation - A backward flowing of solids or fluids.
 
Renal - Relating to the kidney
 
Resting Pulse - The pulse rate measured after a short period of physical and emotional rest.
 
Rhythm - The regularity of the heartbeat. Can be assessed by taking the pulse. see Pulse
 
Right Atrium - The right atrium receives dark red blood from the other parts of the body through the veins.
 
Right Ventricle - Forces blood into the pulmonary artery to be carried to the lungs.