L27-Circulation-1 - Circulatory Systems Will not cover the...

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Circulatory Systems Will not cover the physics of circulation systems Read: Chapter 8, pages 348 - 362; 387-401
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Functions The functions of the circulatory system can be divided into three categories: Transportation: Provide all of the substances essential for cellular metabolism, including resp iratory gases (O2), nutrients; removal of metabolic waste (CO2, nitrogenous wastes, e xcessive water and ions). · Regulation: carries hormones, growth factors and cytokines; regulates local temperature. Protection: protect tissues against foreign microbes, toxins and injuries  
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Basic design requirement and major components The circulatory system is often divided into the cardiovascular system and the lymphatic system. (Focus in this class - the cardiovascular system). The cardiovascular system includes: Pressure source - the heart. Distribution system - arterial system. Transfer - microdistribution - capillaries. Return system and blood reservoir - venous systems.
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In less derived animals, pumping is by rhythmic squeezing of blood vessels and accessory hearts, retained as muscle massage in vertebrates. More derived animals have central pumps, called hearts. Closed system vs. open systems All vertebrate animals have closed circulatory systems. Closed systems can support higher activity, because they: Are more efficient for gas exchange; · Can direct blood to specific tissues; · Can retain cellular components;
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This note was uploaded on 05/29/2011 for the course BIO 225 taught by Professor Pavgi during the Spring '08 term at University of Michigan.

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L27-Circulation-1 - Circulatory Systems Will not cover the...

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