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The Hear4 - The Heart Blood Supply to the Heart The left...

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The Heart Blood Supply to the Heart The left and right coronary arteries originate from the base of the aorta and supply the heart. Blood returns from heart tissue to the right atrium through the coronary veins and coronary sinus. Heart Chambers There are four chambers in the heart. The left and right atria receive blood from veins, function mainly as reservoirs. Contraction of the atria completes ventricular filling. The atria are separated internally from each other by the interatrial septum. The ventricles are the main pumping chambers of the heart. The right ventricle pumps blood into the pulmonary trunk and the left ventricle, which has a thicker wall, pumps blood into the aorta. The ventricles are separated internally by the interventricular septum. Heart Valves The heart valves ensure one-way flow of blood. The tricuspid valve (three cusps) separates the right atrium and right ventricle, and the bicuspid valve (two cusps) separates the left atrium and left ventricle.
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