Biology 2601A/B Lecture Notes - Lecture 14: Sponge, Convergent Evolution, Mollusca

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High pressure system with pumping of the heart: described circulatory system where blood contained in vessels and moved around body, used animals to compare with human body, 1628 manuscript (in 40s) Most based on theory, didn"t have proper knowledge (no microscope) Later on they found that arterial system connected to veins (venal: blood moves around the body in a circuit, capillaries not seen. Circulation from a biodiversity perspective: mechanical view (circulatory system if, pressure (heart) High pressure system, heart pumping all the time, expensive system. Arteries capillary beds, increasing cross sectional area of system. When blood leaves heart = high pressure, then when it gets to veins pressure lowers, then delivered to place where oxygen is needed. Aorta arteries arterioles capillaries venules veins vena cava. On land = more diverse and complicated b/c gravity: fluid (blood, tubes (vessels) & or spaces. Need some kind of convection to move o2 diffusion too slow.

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