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Unformatted text preview: Figure 42.2 Circular canal Mouth Radial canals 5 cm (a) The moon jelly Aurelia , a cnidarian (b) The planarian Dugesia , a flatworm Gastrovascular cavity Mouth Pharynx 2 mm Most animals need a circulatory system because A. diffusion is only efficient for short distances. B. there is no other way to distribute oxygen. C. they do not live in water. D. “civil blood makes civil hands unclean.” E. of gravity. Figure 42.3 (a) An open circulatory system Heart Hemolymph in sinuses surrounding organs Pores Tubular heart Dorsal vessel (main heart) Auxiliary hearts Small branch vessels in each organ Ventral vessels Blood Interstitial fluid Heart (b) A closed circulatory system Figure 42.4a (a) Single circulation Artery Heart: Atrium (A) Ventricle (V) Vein Gill capillaries Body capillaries Key Oxygen-rich blood Oxygen-poor blood Incompressible Fluid Flow Figure 42.10c 15 μ m LM Red blood cell Capillary Figure 42.11 0 10 20 30 40 50 Velocity (cm/sec) Area (cm 2 ) 0 1,000 2,000 3,000 4,000 5,000 Effect of Friction Figure 42.4a (a) Single circulation Artery Heart: Atrium (A) Ventricle (V) Vein Gill capillaries Body capillaries Key Oxygen-rich blood Oxygen-poor blood Body Gas Exchange Heart Single Circulation A V Body Gas Exchange Double Circulation Pump1 Pump 2 V V A A If the two pumps in double circulation...
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- Spring '11
- right ventricle, left ventricle, Gill