The lungs of mammals including those of humans, have a soft, spongelike texture and are honeycombed with epithelium, having a much larger surface area in total than the outer surface area of the lung itself. The human heart is a vital organ that functions as a pump, providing a continuous circulation of blood through the body, by way of the cardiac cycles.
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anatomy aorta artery atrium biology blood body cardiac cardiology cardiovascular care cava circulation circulatory coronary diagram diastole flow health healthcare heart human illustration internal intestine left medical medicine muscle organ organs pathology pulmonary pulse pumping right science section system systole valve vein ventricle
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