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31)IntercellularTranspPOSTSpr11red

31)IntercellularTranspPOSTSpr11red - Intercellular...

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1 Intercellular Transport Playing with Pressure Unity of Life Physical Principles of Flow Bulk Flow Flow rate a function of Pressure gradient Resistance (V/t) = _____________ Resistance varies inversely with r __ Pressure gradient established by a pump (or pumps) Diversity of (vertebrate) Life Will focus on vertebrates. Why? Circulatory systems in “invertebrates” relatively simple Either absent or open (with a few exceptions) The great invertebrate radiations don’t seem to be tied in with innovations in the circulatory system Focus on vertebrates allows us to See how principles of fluid flow are exploited based on a common plan within a very diverse group Revisit gas exchange - very important for vertebrates Consider three of the most impressive things that animals can do in the only group that combines them Vertebrate breakthroughs High ________________ Extremely so in mammals and birds (convergently) Terrestriality Can use air as a respiratory medium Use of air _______ origin of terrestriality Large size All of these are facilitated by innovations of the cardiovascular and respiratory systems!!
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2 Vertebrates - General Principles Ventilation vs.Circulation Two pumps _________ - Movement of the respiratory medium Circulation - Movement of the blood Why have two pumps? Principle : Diffusion only for _____________________ Kardong, K. 1995. Vertebrates. General design of closed circulatory system Heart -> arteries -> capillaries -> veins -> heart C&R 42.2b General design of closed circulatory system Heart -> arteries -> capillaries -> veins -> heart C&R 42.2b General design of closed circulatory system Heart -> arteries -> capillaries -> veins -> heart General principles Greater _____ Hagen- Poiseuille equation.
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