BIOL 201 Lecture Notes - Lecture 18: Circulatory System, Gastrovascular Cavity, Water Vascular System

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Distribution of materials in an organism: unicellular organisms move materials through cyclosis and along the cytoskeleton, multicellular organisms also do it but they use a whole system to do larger level tasks. These are radical canals that connect with a ring central one and tubes on their feat (water vascular system: chordata: closed circulatory system. Blood passes through the gills and it is then high in o2 concentration. The heart pumps through these circuits simultaneously, making it much faster than fish: mammal and bird, four chambered heart, two atri and two ventricles, closed system through the same two circuits. Human circulatory system: heart: four chambers, arteries: blood pumped out of the heart, carry blood from the heart pumped by ventricles. Contain blood in the space surrounded by epithelial tissue called endothelium, around it there is a layer of smooth muscle, and the outer layer surrounding the smooth muscle is of connective tissue.

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