BIOLOGY 2A03 Lecture Notes - Lecture 15: Papillary Muscle, Diastole, Aortic Valve
4 May 2017
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Document Summary
Some small multicellular things don"t bc diffusion is sufficient. Needs for exchange with its environment happen with diffusion. Diffusion is proportional to the square of the distance that something has to travel. Fast convection for moving things around the body quicker than diffusion. Invertebrates have diff circulatory system s but they"re doing similar things. Distribution - getting rid of stuff, moving things around. Heat dissipation (thermoregulation - get rid of heat from the core of our body). System of tubes allowing blood to pump away from heart. Exchange vessels - mo1ve from inside convective system to cells that need exchange. Venous system - collecting tubes taking collective medium from capillaries to the organ (heart) so it can continue. Interstitial fluid around cells, plasma has similar composition. Haematocrit - proportion of blood composed of red blood cells. Pulmonary - blood from heart to lungs (gas exchange)
