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BLOOD FLOW through the HEART Biology Version: The right and left sides of the heart work together Right Side Blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium. Left Side The pulmonary vein empties oxygen-rich blood, from the lungs into the left atrium. Atrial contraction Right Side Blood flows from your right atrium into your right ventricle through the open tricuspid valve. When the ventricles are full, the tricuspid valve shuts. This prevents blood from flowing backward into the atria while the ventricles contract (squeeze). Left Side Blood flows from your left atrium into your left ventricle through the open mitral valve. When the ventricles are full, the mitral valve shuts. This prevents blood from flowing backward into the atria while the ventricles contract (squeeze). Ventricular contraction Oxygen and carbon dioxide travels to and from tiny air sacs in the lungs, through the walls of the capillaries, into the blood. Right Side Blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs. Left Side Blood leaves the heart through the aortic valve, into the aorta and to the body. This pattern is repeated, causing blood to flow continuously to the heart, lungs and body. Anatomy Version Superior Vena Cava Superior Vena Cava Inferior Vena Cava Superior Vena Cava Inferior Vena Cava Superior Vena Cava Right Atrium Inferior Vena Cava Superior Vena Cava Right Atrium Inferior Vena Cava Superior Vena Cava Right Atrium Inferior Vena Cava Superior Vena Cava Right Atrium Inferior Vena Cava Superior Vena Cava Right Atrium Inferior Vena Cava Right Ventricle Superior Vena Cava Right Atrium Inferior Vena Cava Right Ventricle Superior Vena Cava Inferior Vena Cava Pulmonary Semilunar Valve Right Atrium Right Ventricle Superior Vena Cava Pulmonary Semilunar Valve Right Atrium Inferior Vena Cava Right Ventricle Superior Vena Cava Pulmonary Trunk Pulmonary Semilunar Valve Right Atrium Inferior Vena Cava Right Ventricle Superior Vena Cava Pulmonary Trunk Pulmonary Semilunar Valve Right Atrium Inferior Vena Cava Right Ventricle Superior Vena Cava Pulmonary Arteries Pulmonary Trunk Pulmonary Semilunar Valve Right Atrium Inferior Vena Cava Right Ventricle Pulmonary Arteries Superior Vena Cava Pulmonary Trunk Pulmonary Semilunar Valve Right Atrium Inferior Vena Cava Right Ventricle Lungs Pulmonary Arteries Superior Vena Cava Pulmonary Trunk Pulmonary Semilunar Valve Right Atrium Inferior Vena Cava Right Ventricle Lungs Pulmonary Arteries Superior Vena Cava Pulmonary Trunk Pulmonary Semilunar Valve Right Atrium Inferior Vena Cava Right Ventricle Lungs Pulmonary Arteries Superior Vena Cava Pulmonary Trunk Pulmonary Semilunar Valve Right Atrium Inferior Vena Cava Right Ventricle Pulmonary Veins Lungs Pulmonary Arteries Superior Vena Cava Pulmonary Trunk Pulmonary Semilunar Valve Right Atrium Inferior Vena Cava Right Ventricle Pulmonary Veins Lungs Pulmonary Veins Pulmonary Arteries Superior Vena Cava Pulmonary Trunk Pulmonary Semilunar Valve Right Atrium Inferior Vena Cava Right Ventricle Left Atrium Lungs Pulmonary Veins Pulmonary Arteries Superior Vena Cava Pulmonary Trunk Pulmonary Semilunar Valve Right Atrium Inferior Vena Cava Right Ventricle Left Atrium Pulmonary Loop Lungs Pulmonary Veins Pulmonary Arteries Superior Vena Cava Pulmonary Trunk Pulmonary Semilunar Valve Right Atrium Inferior Vena Cava Right Ventricle Left Atrium Pulmonary Loop Lungs Pulmonary Veins Pulmonary Arteries Superior Vena Cava Pulmonary Trunk Pulmonary Semilunar Valve Right Atrium Inferior Vena Cava Right Ventricle Left Atrium Pulmonary Loop Lungs Pulmonary Veins Pulmonary Arteries Superior Vena Cava Pulmonary Trunk Pulmonary Semilunar Valve Right Atrium Inferior Vena Cava Right Ventricle Left Atrium Pulmonary Loop Lungs Pulmonary Veins Pulmonary Arteries Superior Vena Cava Pulmonary Trunk Pulmonary Semilunar Valve Right Atrium Inferior Vena Cava Right Ventricle Left Atrium Pulmonary Loop Lungs Pulmonary Veins Pulmonary Arteries Superior Vena Cava Pulmonary Trunk Left Atrium Pulmonary Semilunar Valve Right Atrium Inferior Vena Cava Right Ventricle Left Ventricle Pulmonary Loop Lungs Pulmonary Veins Pulmonary Arteries Superior Vena Cava Pulmonary Trunk Left Atrium Pulmonary Semilunar Valve Right Atrium Inferior Vena Cava Right Ventricle Left Ventricle Pulmonary Loop Lungs Pulmonary Veins Pulmonary Arteries Superior Vena Cava Intraventricular Septum Pulmonary Trunk Left Atrium Pulmonary Semilunar Valve Right Atrium Inferior Vena Cava Right Ventricle Left Ventricle Pulmonary Loop Lungs Pulmonary Veins Pulmonary Arteries Superior Vena Cava Pulmonary Trunk Left Atrium Pulmonary Semilunar Valve Intraventricular Septum Right Atrium Inferior Vena Cava Right Ventricle Left Ventricle Pulmonary Loop Lungs Pulmonary Veins Pulmonary Arteries Superior Vena Cava Left Atrium Aortic Semilunar Valve Pulmonary Trunk Pulmonary Semilunar Valve Intraventricular Septum Right Atrium Inferior Vena Cava Right Ventricle Left Ventricle Pulmonary Loop Lungs Pulmonary Veins Pulmonary Arteries Superior Vena Cava Pulmonary Trunk Inferior Vena Cava Right Ventricle Left Atrium Aortic Semilunar Valve Pulmonary Semilunar Valve Intraventricular Septum Right Atrium Left Ventricle Pulmonary Loop Lungs Pulmonary Veins Pulmonary Arteries Superior Vena Cava Aortic Trunk Inferior Vena Cava Right Ventricle Left Atrium Aortic Semilunar Valve Pulmonary Trunk Pulmonary Semilunar Valve Intraventricular Septum Right Atrium Left Ventricle Pulmonary Loop Lungs Pulmonary Veins Pulmonary Arteries Superior Vena Cava Inferior Vena Cava Right Ventricle Aortic Trunk Left Atrium Aortic Semilunar Valve Pulmonary Trunk Pulmonary Semilunar Valve Intraventricular Septum Right Atrium Left Ventricle Pulmonary Loop Lungs Brachiocephalic Artery Pulmonary Veins Pulmonary Arteries Superior Vena Cava Inferior Vena Cava Right Ventricle Aortic Trunk Left Atrium Aortic Semilunar Valve Pulmonary Trunk Pulmonary Semilunar Valve Intraventricular Septum Right Atrium Left Ventricle Pulmonary Loop Lungs Brachiocephalic Artery Pulmonary Veins Pulmonary Arteries Superior Vena Cava Inferior Vena Cava Right Ventricle Aortic Trunk Left Atrium Aortic Semilunar Valve Pulmonary Trunk Pulmonary Semilunar Valve Intraventricular Septum Right Atrium Left Ventricle Pulmonary Loop Left Common Corotid Artery Lungs Brachiocephalic Artery Pulmonary Veins Pulmonary Arteries Superior Vena Cava Inferior Vena Cava Right Ventricle Aortic Trunk Left Atrium Aortic Semilunar Valve Pulmonary Trunk Pulmonary Semilunar Valve Intraventricular Septum Right Atrium Left Ventricle Pulmonary Loop Left Common Corotid Artery Lungs Brachiocephalic Artery Pulmonary Veins Pulmonary Arteries Superior Vena Cava Inferior Vena Cava Right Ventricle Aortic Trunk Left Atrium Aortic Semilunar Valve Pulmonary Trunk Pulmonary Semilunar Valve Intraventricular Septum Right Atrium Left Ventricle Pulmonary Loop Left Subclavian Artery Left Common Corotid Artery Lungs Brachiocephalic Artery Pulmonary Veins Pulmonary Arteries Superior Vena Cava Inferior Vena Cava Right Ventricle Aortic Trunk Left Atrium Aortic Semilunar Valve Pulmonary Trunk Pulmonary Semilunar Valve Intraventricular Septum Right Atrium Left Ventricle Pulmonary Loop Left Common Corotid Artery Lungs Left Subclavian Artery Brachiocephalic Artery Pulmonary Veins Pulmonary Arteries Superior Vena Cava Inferior Vena Cava Right Ventricle Aortic Trunk Left Atrium Aortic Semilunar Valve Pulmonary Trunk Pulmonary Semilunar Valve Intraventricular Septum Right Atrium Left Ventricle Pulmonary Loop Left Common Corotid Artery Lungs Left Subclavian Artery Brachiocephalic Artery Aorta Pulmonary Arteries Superior Vena Cava Inferior Vena Cava Right Ventricle Aortic Trunk Left Atrium Aortic Semilunar Valve Pulmonary Trunk Pulmonary Semilunar Valve Intraventricular Septum Right Atrium Left Ventricle Pulmonary Veins Pulmonary Loop Left Common Corotid Artery Lungs Left Subclavian Artery Brachiocephalic Artery Aorta Pulmonary Arteries Superior Vena Cava Inferior Vena Cava Right Ventricle Aortic Trunk Left Atrium Aortic Semilunar Valve Pulmonary Trunk Pulmonary Semilunar Valve Intraventricular Septum Right Atrium Left Ventricle Pulmonary Veins Pulmonary Loop Left Common Corotid Artery Lungs Left Subclavian Artery Brachiocephalic Artery Aorta Pulmonary Arteries Pulmonary Veins Superior Vena Cava Inferior Vena Cava Right Ventricle Aortic Trunk Left Atrium Arteries Aortic Semilunar Valve Pulmonary Trunk Pulmonary Semilunar Valve Intraventricular Septum Right Atrium Left Ventricle Pulmonary Loop Left Common Corotid Artery Lungs Left Subclavian Artery Brachiocephalic Artery Aorta Pulmonary Arteries Pulmonary Veins Superior Vena Cava Inferior Vena Cava Right Ventricle Aortic Trunk Left Atrium Aortic Semilunar Valve Pulmonary Trunk Pulmonary Semilunar Valve Intraventricular Septum Right Atrium Arteries Left Ventricle Pulmonary Loop Left Common Corotid Artery Lungs Left Subclavian Artery Brachiocephalic Artery Aorta Pulmonary Arteries Pulmonary Veins Superior Vena Cava Inferior Vena Cava Aortic Trunk Left Atrium Aortic Semilunar Valve Pulmonary Trunk Pulmonary Semilunar Valve Intraventricular Septum Right Atrium Right Ventricle Arteries Left Ventricle Body Pulmonary Loop Left Common Corotid Artery Lungs Left Subclavian Artery Brachiocephalic Artery Aorta Pulmonary Arteries Pulmonary Veins Superior Vena Cava Inferior Vena Cava Right Ventricle Aortic Trunk Left Atrium Aortic Semilunar Valve Pulmonary Trunk Pulmonary Semilunar Valve Intraventricular Septum Right Atrium Arteries Left Ventricle Body Tissues Pulmonary Loop Left Common Corotid Artery Lungs Left Subclavian Artery Brachiocephalic Artery Aorta Pulmonary Arteries Pulmonary Veins Superior Vena Cava Inferior Vena Cava Right Ventricle Aortic Trunk Left Atrium Aortic Semilunar Valve Pulmonary Trunk Pulmonary Semilunar Valve Intraventricular Septum Right Atrium Arteries Left Ventricle Veins Body Tissues Pulmonary Loop Left Common Corotid Artery Lungs Left Subclavian Artery Brachiocephalic Artery Aorta Pulmonary Arteries Pulmonary Veins Superior Vena Cava Inferior Vena Cava Right Ventricle Aortic Trunk Left Atrium Aortic Semilunar Valve Pulmonary Trunk Pulmonary Semilunar Valve Intraventricular Septum Right Atrium Arteries Left Ventricle Veins Body Tissues Pulmonary Loop Left Common Corotid Artery Lungs Left Subclavian Artery Brachiocephalic Artery Aorta Pulmonary Arteries Pulmonary Veins Superior Vena Cava Inferior Vena Cava Right Ventricle Veins Aortic Trunk Left Atrium Aortic Semilunar Valve Pulmonary Trunk Pulmonary Semilunar Valve Intraventricular Septum Right Atrium Arteries Left Ventricle Systemic Loop Body Tissues Pulmonary Loop Left Common Corotid Artery Lungs Left Subclavian Artery Brachiocephalic Artery Aorta Pulmonary Arteries Pulmonary Veins Superior Vena Cava Inferior Vena Cava Right Ventricle Aortic Trunk Left Atrium Aortic Semilunar Valve Pulmonary Trunk Pulmonary Semilunar Valve Intraventricular Septum Right Atrium Arteries Left Ventricle Veins Body Tissues Systemic Loop Pulmonary Loop Left Common Corotid Artery Lungs Left Subclavian Artery Brachiocephalic Artery Aorta Pulmonary Arteries Pulmonary Veins Superior Vena Cava Inferior Vena Cava Right Ventricle Aortic Trunk Left Atrium Aortic Semilunar Valve Pulmonary Trunk Pulmonary Semilunar Valve Intraventricular Septum Right Atrium Arteries Left Ventricle Veins Body Tissues Systemic Loop
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