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Unformatted text preview: from the tissue fluid. The lymphatic system is discussed in chapter 16. Absorption and Excretion Organs in several systems absorb nutrients and oxygen and excrete wastes. The organs of the digestive system (fig. 1.15), for example, receive foods from the outside. Then they break down food molecules into simpler forms that can pass through cell membranes and thus be absorbed into the internal environment. Materials that are not absorbed are eliminated by being trans ported outside. Certain digestive organs (chapter 17) Cardiovascular system Lymphatic system F IGURE LIZ Organ systems associated with transport. excretion. C M APTER ONE (ntroduction to Human Anatomy and Physiology Respiratory system 17...
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