Assignment 5 - Heartrate in Daphnia (water flea) Environment of Daphnia Control Setup: Pond water/control (normal) Experimental 1: Four drops of 10% ethanol Experimental 2: Eight drops of 10% ethanol Experimental 3: 14 Next week Heartbeats per 10 seconds Twelve drops of 10% ethanol 21. What is the dependent variable in this experiment? Independent variable? DV- IV - 22. List three potential "variables held constant" that researchers most likely had in place in the lab setting where this experiment took place? 23. What conclusion can you form from this data? (please use your own words) Next week Assignment 3 - The Pattern of Circulation your slides, draw a cross section of these vessels showing the relative diameter of the 7. From vessel interior and thickness of the wall. Typical Vein 40x Typical Artery 40x . Clogged Artery (Atherosclerosis) 40x 8. Write the name of the type of blood vessels described. a. carry blood toward the heart b. carry blood away from the heart c. smallest arteries d. smallest veins e. smallest blood vessels 9. By what process are materials exchanged between capillary blood and body cells? 10. Explain the hazards of atherosclerosis. 11. What arteries carry deoxygenated blood? 12. What veins carry oxygenated blood? 11

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