BIOL273 Lecture Notes - Lecture 1: Atrioventricular Block, Heart Valve, Atrioventricular Node

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12 Jul 2017
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Role of the cardiovascular system: multi- cellular organisms. The problem with being multicellular is that you are very big. Only the surface layer is in contact with environment. Rate of diffusion of oxygen and nutrients is limited by distance. Cardiovascular system for transport of substances through the body. Transported by flow of blood through circulatory system. Series of fluid-filled tubes connected to a pump. Feature of organisms too large to transport oxygen and nutrients by simple diffusion. Substances transferred via bulk flow, then diffusion: materials transported. Many cells absolutely require oxygen to survive. Brain most oxygen dependent organ in human body: 5-10 secs of interrupted blood flow loss of consciousness, 5-10 min of interrupted blood flow permanent brain damage. Blood cells and plasma fluid: blood vessels vessels that carry blood away from the heart arteries vessels that carry blood to the heart veins system of valves keeps blood moving in one direction.

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