Analice y nombre el tipo de filamento intermedio que trata el artículo, y qué ubicación tienen en las células.

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when it is at an intermediate population density

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 of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.