EEB202H1 Lecture Notes - Pseudobranch, Umbilical Vein, Pulmonary Circulation

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Vertebrates have a closed cardiovascular or circulatory system meaning that blood passes through and rarely leaves a system of vessels or tubes. While the fluid components of blood can leave the tubes, it is rare that actual components of blood cells (called formed elements) ever leave the tubes. While we can get part of fluid portion of the blood leaving the tubes, the blood cells under normal circumstances do not contact the body cells, which lie in their own interstitial fluid. There are 4 basic parts of cvs : muscular heart: receives blood at one end and pumps out on the other end, arteries: system of tubes that carries blood away from the heart. A kind of blood (in terms of oxygenation level) in a vessel does not determine what the vessel is. What determines the kind of a vessel is the direction of the blood: vein: vessels that bring blood to the heart, capillary networks: joining arteries & veins.

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