BSC-2010 Chapter Notes - Chapter 42: Blood Plasma, Cell Potency, Blood Vessel

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Internal transport and gas exchange are functionally related in most animals! The molecular trade that an animal carries out with its environment - the gaining of o2 and nutrients while shedding co2 and other waste products - must ultimately involve every cell int the body. Small molecules, including o2 and co2, can move between cells and their immediate surroundings by di usion. When there is a di erence in concentration, di usion can result in net movement. Animals whose body shapes put many of their cells into contact with their environment, enables them to live without a distinct circulatory system. A central gastrovascular cavity, in hyras, jellies, and other cnidarians, functions in the distribution of substances throughout the body, as well as in digestion. An opening at one end connect the cavity to the surrounding water. In animals with a gastrovascular cavity, uid bathes both the inner and outer tissue layers, facilitating exchange of gases and cellular waste.

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