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bild2_1 - BILD 2: Multicellular Life [Website:

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BILD 2: Multicellular Life [Website: http://www.biology.ucsd.edu/classes/bild2.WI11.1] Instructor: Darwin K. Berg dberg@ucsd.edu
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External environment Food CO 2 O 2 Mouth Animal body Respiratory system Circulatory system Nutrients Excretory system Digestive system Heart Blood Cells Interstitial fluid Anus Unabsorbed matter (feces) Metabolic waste products (urine) The lining of the small intestine, a diges- tive organ, is elaborated with fingerlike projections that expand the surface area for nutrient absorption (cross-section, SEM). A microscopic view of the lung reveals that it is much more spongelike than balloonlike. This construction provides an expansive wet surface for gas exchange with the environment (SEM). Inside a kidney is a mass of microscopic tubules that exhange chemicals with blood flowing through a web of tiny vessels called capillaries (SEM). 0.5 cm
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bild2_1 - BILD 2: Multicellular Life [Website:

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