BIOA02H3 Chapter 49: Chapter 49

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BIOA02H3 Full Course Notes
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BIOA02H3 Full Course Notes
Verified Note
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Document Summary

Circulatory/cardiovascular system = a muscular pump (heart), a fluid (blood), a series of conduits (blood vessels). Function of the system = transport heat, hormones, respiratory gases, blood cells, platelets, nutrients, & waste products. Not all animals have circulatory systems because their cells are close enough to the external environment for such transport to occur w/o one; sa = Sometimes acquatic invertebrates have highly branched central cavities called gastrovascular systems that bring the external environment into the animals. All cell nutrients come from extracellular fluid and all waste is disposed of there. Open system = vessels of these animals empty their fluid directly into the tissues and later the extracellular fluid flows back into the circulatory system to be pumped back out again. Insects on their circulatory systems for respiratory gas exchange. have open system but can achieve high levels of metabolic output because they do not depend.