![]() ![]() While the left atrium has a large hollow space for this blood to collect, the left auricle is able to increase the collecting and pumping capacity of the left atrium without greatly increasing the size of the atrium. The left atrium’s job is to collect this blood and pump it to the left ventricle, which in turn pumps the blood to the body’s tissues. Endothelium lines the inner surface of all blood vessels and the heart to keep blood cells within the circulatory system and to prevent platelets from sticking to the walls and forming blood clots.ĭuring the contraction cycle of the heart, oxygenated blood from the lungs passes through the pulmonary veins and enters the heart at the left atrium. Endocardium is made of a specialized type of simple squamous epithelial tissue known as endothelium.
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