Worm Lab Report

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Title: The Effect of Nicotine on the Heart Rate of the Lumbriculus Variegatus
Background- This lab is being done to demonstrate the effects of stimulants on the circulatory system of blackworms. In this lab, the stimulant we have chosen to use is Nicotine. A stimulant is an agent that causes increased activity, especially in the nervous or cardiovascular systems. In this lab, we will put blackworms into the Nicotine to look at the differences in pulse rates when compared to a control. The proper name for blackworms is Lumbriculus Variegatus, they are freshwater worms most commonly found in North America and Europe. The blood in blackworms circulates from the dorsal blood vessel toward the head through a series of
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Trial 2: Shaking began at 19 seconds, stopped at 0:56. Table 3 – Heart Rate after One Minute Exposure to Diluted Nicotine (2.5mL of Nicotine and 1mL of H2O) Worm # | Pulse/Min | 1 | 15 | 2 | 16 | 3 | 17 | 4 | 13 | 5 | 14 | 6 | 12 | 7 | 15 | 8 | 15 | 9 | 22 |
Mean-15.4, Median-15
-Table 1 shows the heart rates of worms in the control, their average heart rate is at 10.7 pulse/min. Table 2 shows the worms in the 2.5mL of Nicotine which proved to be too strong. Table 3 shows the heart rates of worms in the diluted solution of 2.5mL Nicotine and 1mL H2O. Table 3 shows that the heart rate of worms is faster in the nicotine with the average pulse rate at 15.5 pulse/min.

-This table shows the data for the 15 control worms in water and then the same 15 in Nicotine. There are not 15 worms in the nicotine solution because our first solution was too strong and 6 of the worms died. The solution being used in this graph is 2.5 mL of Nicotine and 1 mL H20. This graph shows that the pulse rates of worms in Nicotine tend to be higher than that of the worms in water. This data proves the idea that stimulants raise heart rate.

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