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Name: Class: Date: # ___ Circulation (Ch 27.3) Type of Circulatory System Drawings Open Draw what it would look like in a grasshopper (Sketch the inset picture of Figure 27-9 below) Found in which animals? Describe the heart (or heart-like) organ Arthropods – insects, spiders, crustaceans, millipedes, centipedes Mollusks (2 pts.) Single chamber Hemolymph + other notes (2 pts.) Draw and color-code a single-loop closed circulatory system Aquatic vertebrates – fish sketch and color (2 pts.) Earthworms (1 pt.) Ventricle and atrium (>1 chamber) + other notes (2 pts.) sketch (1 pts.) sketch and label (1 pt.) Closed (Sketch the inset picture of Figure 27-10 below) sketch and label (1 pt.) Draw and color-code a double-loop closed circulatory system sketch and color (2 pts.) Terrestrial vertebrates – reptiles, birds, mammals, amphibians (1 pts.) 3 or 4 chambers +other notes (2 pts.) Describe relative efficiency. Why is this so? (2 pts.) Least efficient – variable pressure – tissues soaked in hemolymph (blood is mixed with other body fluids) – speed of circulation is limited to diffusion speed (slow) (2 pts.) More efficient – constant pressure – separation of oxygen-rich and oxygen-poor blood – but gills get oxygen from water, so process is slowed down at that point (2 pts.) Most efficient – high pressure, so blood travels very quickly throughout the body – separation of oxygen-rich and oxygen-poor blood lungs get oxygen from the air, so more can diffuse Compare and contrast open and closed circulatory systems (2 pts.) Open Closed - tissues soaked in hemolymph - oxygen diffuses from hemolymph through cell membranes of body tissue - heart or heart-like organ that contracts (muscular) - no direct contact between tissue and blood - oxygen diffuses from capillaries to the cells Infer how many chambers a bird’s heart has. Justify your answer. - Four chambers, so that oxygen-rich and oxygen-poor blood flow separately. This allows for more efficient circulation, which is needed for a bird’s high metabolism (flight)
