Roles of the circulatory system Deliver nutrients Deliver gasses Remove waste Circulate hormones Immune function Blood is composed of plasma and cells Red blood cells transport oxygen filled with hemoglobin develop from stem cells in bone marrow How is CO2 transported? Some stays dissolved in plasma, some picked up by hemoglobin, and most reacts with H2O in RBCs and is then carried as tricarbonate in plasma Three categories of vessels in the heart arteries veins capillaries Arteries carry blood away from heart and don?t have valves Veins return blood to the heart and have valves Capillaries convey blood between arteries and veins within each organ Valves in veins block blood from flowing in the wrong direction due to muscle contraction Two chambered hearts have blood pressure issues single circulation blood gets pumped once and passes through two capillary beds before back to the heart found in fish Three chambered hearts no blood pressure issues double circulation mixture of O2 rich and O2 poor blood found in amphibians Four chambered hearts double circulation separation of O2 rich and O2 poor blood provide vigorous flow of blood to the organs found in mammals and birds Endotherms generate their own heat and maintain relatively constant body temperature have big lungs eat more require more energy to run their kidneys Ectotherms body temperature changes with the environmental temperature
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